[PATCH] nmap: Update to work with python3 - Development

10 May 2021

- Added PYTHON=python3 prior to configure. This then builds nmap with
   python3. ndiff is written as python2 only and the Makefile will not
   build ndiff if python2.x is not available. Complicated check system
   that I was unable to understand and patch to check for python3 instead
- Converted ndiff.py and associated setup.py with 2to3 converter and
   created a patch to apply to ndiff.py and setup.py in the lfs
- Added --without-ndiff to configure so Makefile does not check if it can
   build ndiff with python2 or not. Added separate command to build
   ndiff.py with python3
Signed-off-by: Adolf Belka adolf.belka@ipfire.org
---
 config/rootfiles/packages/nmap         |    3 +-
 lfs/nmap                               |   16 +-
 src/patches/nmap-7.91-2to3-ndiff.patch | 1246 ++++++++++++++++++++++++
 3 files changed, 1257 insertions(+), 8 deletions(-)
 create mode 100644 src/patches/nmap-7.91-2to3-ndiff.patch

diff --git a/config/rootfiles/packages/nmap b/config/rootfiles/packages/nmap
index 028408ca0..837c81a71 100644
--- a/config/rootfiles/packages/nmap
+++ b/config/rootfiles/packages/nmap
@@ -2,8 +2,7 @@ usr/bin/ndiff
 usr/bin/nmap
 usr/bin/nping
 #usr/bin/uninstall_ndiff
-usr/lib/python2.7/site-packages/ndiff.py
-#usr/lib/python2.7/site-packages/ndiff.pyc
+usr/lib/python3.8/site-packages/ndiff.py
 #usr/share/man/de/man1/nmap.1
 #usr/share/man/es/man1/nmap.1
 #usr/share/man/fr/man1/nmap.1
diff --git a/lfs/nmap b/lfs/nmap
index d0d4d3428..83b83a511 100644
--- a/lfs/nmap
+++ b/lfs/nmap
@@ -32,7 +32,7 @@ DL_FROM    = $(URL_IPFIRE)
 DIR_APP    = $(DIR_SRC)/$(THISAPP)
 TARGET     = $(DIR_INFO)/$(THISAPP)
 PROG       = nmap
-PAK_VER    = 12
+PAK_VER    = 13
DEPS       =
@@ -77,12 +77,16 @@ $(subst %,%_MD5,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
    @$(PREBUILD)
    @rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar jxf $(DIR_DL)/$(DL_FILE)
+	cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/nmap-7.91-2to3-ndiff.patch
    $(UPDATE_AUTOMAKE)
-	cd $(DIR_APP) && ./configure \
-		--prefix=/usr \
-		--without-nmapfe \
-		--without-zenmap \
-		--without-ncat
+	cd $(DIR_APP) && PYTHON=python3 	\
+			./configure 		\
+			--prefix=/usr 		\
+			--without-nmapfe 	\
+			--without-zenmap 	\
+			--without-ncat		\
+			--without-ndiff
+	cd $(DIR_APP)/ndiff && python3 setup.py install
    cd $(DIR_APP) && make $(MAKETUNING) $(EXTRA_MAKE)
    cd $(DIR_APP) && make install
    @rm -rf $(DIR_APP)
diff --git a/src/patches/nmap-7.91-2to3-ndiff.patch b/src/patches/nmap-7.91-2to3-ndiff.patch
new file mode 100644
index 000000000..5523a9d30
--- /dev/null
+++ b/src/patches/nmap-7.91-2to3-ndiff.patch
@@ -0,0 +1,1246 @@
+diff -Naur nmap-7.91.orig/ndiff/ndiff.py nmap-7.91/ndiff/ndiff.py
+--- nmap-7.91.orig/ndiff/ndiff.py	2020-10-02 15:55:49.000000000 +0200
++++ nmap-7.91/ndiff/ndiff.py	2021-05-10 20:42:14.475398029 +0200
+@@ -26,11 +26,11 @@
+ import xml.sax
+ import xml.sax.saxutils
+ import xml.dom.minidom
+-from StringIO import StringIO
++from io import StringIO
+ 
+ verbose = False
+ 
+-NDIFF_XML_VERSION = u"1"
++NDIFF_XML_VERSION = "1"
+ 
+ 
+ class OverrideEntityResolver(xml.sax.handler.EntityResolver):
+@@ -75,35 +75,35 @@
+     def write_nmaprun_open(self, writer):
+         attrs = {}
+         if self.scanner is not None:
+-            attrs[u"scanner"] = self.scanner
++            attrs["scanner"] = self.scanner
+         if self.args is not None:
+-            attrs[u"args"] = self.args
++            attrs["args"] = self.args
+         if self.start_date is not None:
+-            attrs[u"start"] = "%d" % time.mktime(self.start_date.timetuple())
+-            attrs[u"startstr"] = self.start_date.strftime(
++            attrs["start"] = "%d" % time.mktime(self.start_date.timetuple())
++            attrs["startstr"] = self.start_date.strftime(
+                     "%a %b %d %H:%M:%S %Y")
+         if self.version is not None:
+-            attrs[u"version"] = self.version
+-        writer.startElement(u"nmaprun", attrs)
++            attrs["version"] = self.version
++        writer.startElement("nmaprun", attrs)
+ 
+     def write_nmaprun_close(self, writer):
+-        writer.endElement(u"nmaprun")
++        writer.endElement("nmaprun")
+ 
+     def nmaprun_to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"nmaprun")
++        elem = document.createElement("nmaprun")
+         if self.scanner is not None:
+-            elem.setAttribute(u"scanner", self.scanner)
++            elem.setAttribute("scanner", self.scanner)
+         if self.args is not None:
+-            elem.setAttribute(u"args", self.args)
++            elem.setAttribute("args", self.args)
+         if self.start_date is not None:
+             elem.setAttribute(
+-                    u"start", "%d" % time.mktime(self.start_date.timetuple()))
++                    "start", "%d" % time.mktime(self.start_date.timetuple()))
+             elem.setAttribute(
+-                    u"startstr",
++                    "startstr",
+                     self.start_date.strftime("%a %b %d %H:%M:%S %Y"))
+         if self.version is not None:
+-            elem.setAttribute(u"version", self.version)
++            elem.setAttribute("version", self.version)
+         frag.appendChild(elem)
+         return frag
+ 
+@@ -133,17 +133,17 @@
+ 
+     def format_name(self):
+         """Return a human-readable identifier for this host."""
+-        address_s = u", ".join(a.s for a in sorted(self.addresses))
+-        hostname_s = u", ".join(sorted(self.hostnames))
++        address_s = ", ".join(a.s for a in sorted(self.addresses))
++        hostname_s = ", ".join(sorted(self.hostnames))
+         if len(hostname_s) > 0:
+             if len(address_s) > 0:
+-                return u"%s (%s)" % (hostname_s, address_s)
++                return "%s (%s)" % (hostname_s, address_s)
+             else:
+                 return hostname_s
+         elif len(address_s) > 0:
+             return address_s
+         else:
+-            return u"<no name>"
++            return "<no name>"
+ 
+     def add_port(self, port):
+         self.ports[port.spec] = port
+@@ -160,46 +160,46 @@
+         return state is None or state in self.extraports
+ 
+     def extraports_string(self):
+-        list = [(count, state) for (state, count) in self.extraports.items()]
++        list = [(count, state) for (state, count) in list(self.extraports.items())]
+         # Reverse-sort by count.
+         list.sort(reverse=True)
+-        return u", ".join(
+-                [u"%d %s ports" % (count, state) for (count, state) in list])
++        return ", ".join(
++                ["%d %s ports" % (count, state) for (count, state) in list])
+ 
+     def state_to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+         if self.state is not None:
+-            elem = document.createElement(u"status")
+-            elem.setAttribute(u"state", self.state)
++            elem = document.createElement("status")
++            elem.setAttribute("state", self.state)
+             frag.appendChild(elem)
+         return frag
+ 
+     def hostname_to_dom_fragment(self, document, hostname):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"hostname")
+-        elem.setAttribute(u"name", hostname)
++        elem = document.createElement("hostname")
++        elem.setAttribute("name", hostname)
+         frag.appendChild(elem)
+         return frag
+ 
+     def extraports_to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        for state, count in self.extraports.items():
+-            elem = document.createElement(u"extraports")
+-            elem.setAttribute(u"state", state)
+-            elem.setAttribute(u"count", unicode(count))
++        for state, count in list(self.extraports.items()):
++            elem = document.createElement("extraports")
++            elem.setAttribute("state", state)
++            elem.setAttribute("count", str(count))
+             frag.appendChild(elem)
+         return frag
+ 
+     def os_to_dom_fragment(self, document, os):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"osmatch")
+-        elem.setAttribute(u"name", os)
++        elem = document.createElement("osmatch")
++        elem.setAttribute("name", os)
+         frag.appendChild(elem)
+         return frag
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"host")
++        elem = document.createElement("host")
+ 
+         if self.state is not None:
+             elem.appendChild(self.state_to_dom_fragment(document))
+@@ -208,13 +208,13 @@
+             elem.appendChild(addr.to_dom_fragment(document))
+ 
+         if len(self.hostnames) > 0:
+-            hostnames_elem = document.createElement(u"hostnames")
++            hostnames_elem = document.createElement("hostnames")
+             for hostname in self.hostnames:
+                 hostnames_elem.appendChild(
+                         self.hostname_to_dom_fragment(document, hostname))
+             elem.appendChild(hostnames_elem)
+ 
+-        ports_elem = document.createElement(u"ports")
++        ports_elem = document.createElement("ports")
+         ports_elem.appendChild(self.extraports_to_dom_fragment(document))
+         for port in sorted(self.ports.values()):
+             if not self.is_extraports(port.state):
+@@ -223,13 +223,13 @@
+             elem.appendChild(ports_elem)
+ 
+         if len(self.os) > 0:
+-            os_elem = document.createElement(u"os")
++            os_elem = document.createElement("os")
+             for os in self.os:
+                 os_elem.appendChild(self.os_to_dom_fragment(document, os))
+             elem.appendChild(os_elem)
+ 
+         if len(self.script_results) > 0:
+-            hostscript_elem = document.createElement(u"hostscript")
++            hostscript_elem = document.createElement("hostscript")
+             for sr in self.script_results:
+                 hostscript_elem.appendChild(sr.to_dom_fragment(document))
+             elem.appendChild(hostscript_elem)
+@@ -261,21 +261,21 @@
+         return self.s
+ 
+     def new(type, s):
+-        if type == u"ipv4":
++        if type == "ipv4":
+             return IPv4Address(s)
+-        elif type == u"ipv6":
++        elif type == "ipv6":
+             return IPv6Address(s)
+-        elif type == u"mac":
++        elif type == "mac":
+             return MACAddress(s)
+         else:
+-            raise ValueError(u"Unknown address type %s." % type)
++            raise ValueError("Unknown address type %s." % type)
+     new = staticmethod(new)
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"address")
+-        elem.setAttribute(u"addr", self.s)
+-        elem.setAttribute(u"addrtype", self.type)
++        elem = document.createElement("address")
++        elem.setAttribute("addr", self.s)
++        elem.setAttribute("addrtype", self.type)
+         frag.appendChild(elem)
+         return frag
+ 
+@@ -284,21 +284,21 @@
+ 
+ 
+ class IPv4Address(Address):
+-    type = property(lambda self: u"ipv4")
++    type = property(lambda self: "ipv4")
+ 
+     def sort_key(self):
+         return (0, self.s)
+ 
+ 
+ class IPv6Address(Address):
+-    type = property(lambda self: u"ipv6")
++    type = property(lambda self: "ipv6")
+ 
+     def sort_key(self):
+         return (1, self.s)
+ 
+ 
+ class MACAddress(Address):
+-    type = property(lambda self: u"mac")
++    type = property(lambda self: "mac")
+ 
+     def sort_key(self):
+         return (2, self.s)
+@@ -317,12 +317,12 @@
+ 
+     def state_string(self):
+         if self.state is None:
+-            return u"unknown"
++            return "unknown"
+         else:
+-            return unicode(self.state)
++            return str(self.state)
+ 
+     def spec_string(self):
+-        return u"%d/%s" % self.spec
++        return "%d/%s" % self.spec
+ 
+     def __hash__(self):
+         return hash(self.spec)
+@@ -336,12 +336,12 @@
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"port")
+-        elem.setAttribute(u"portid", unicode(self.spec[0]))
+-        elem.setAttribute(u"protocol", self.spec[1])
++        elem = document.createElement("port")
++        elem.setAttribute("portid", str(self.spec[0]))
++        elem.setAttribute("protocol", self.spec[1])
+         if self.state is not None:
+-            state_elem = document.createElement(u"state")
+-            state_elem.setAttribute(u"state", self.state)
++            state_elem = document.createElement("state")
++            state_elem.setAttribute("state", self.state)
+             elem.appendChild(state_elem)
+         elem.appendChild(self.service.to_dom_fragment(document))
+         for sr in self.script_results:
+@@ -385,7 +385,7 @@
+         if len(parts) == 0:
+             return None
+         else:
+-            return u"/".join(parts)
++            return "/".join(parts)
+ 
+     def version_string(self):
+         """Get a string like in the VERSION column of Nmap output."""
+@@ -395,17 +395,17 @@
+         if self.version is not None:
+             parts.append(self.version)
+         if self.extrainfo is not None:
+-            parts.append(u"(%s)" % self.extrainfo)
++            parts.append("(%s)" % self.extrainfo)
+ 
+         if len(parts) == 0:
+             return None
+         else:
+-            return u" ".join(parts)
++            return " ".join(parts)
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"service")
+-        for attr in (u"name", u"product", u"version", u"extrainfo", u"tunnel"):
++        elem = document.createElement("service")
++        for attr in ("name", "product", "version", "extrainfo", "tunnel"):
+             v = getattr(self, attr)
+             if v is None:
+                 continue
+@@ -435,53 +435,53 @@
+         result = []
+         lines = self.output.splitlines()
+         if len(lines) > 0:
+-            lines[0] = self.id + u": " + lines[0]
++            lines[0] = self.id + ": " + lines[0]
+         for line in lines[:-1]:
+-            result.append(u"|  " + line)
++            result.append("|  " + line)
+         if len(lines) > 0:
+-            result.append(u"|_ " + lines[-1])
++            result.append("|_ " + lines[-1])
+         return result
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        elem = document.createElement(u"script")
+-        elem.setAttribute(u"id", self.id)
+-        elem.setAttribute(u"output", self.output)
++        elem = document.createElement("script")
++        elem.setAttribute("id", self.id)
++        elem.setAttribute("output", self.output)
+         frag.appendChild(elem)
+         return frag
+ 
+ 
+ def format_banner(scan):
+     """Format a startup banner more or less like Nmap does."""
+-    scanner = u"Nmap"
+-    if scan.scanner is not None and scan.scanner != u"nmap":
++    scanner = "Nmap"
++    if scan.scanner is not None and scan.scanner != "nmap":
+         scanner = scan.scanner
+     parts = [scanner]
+     if scan.version is not None:
+         parts.append(scan.version)
+-    parts.append(u"scan")
++    parts.append("scan")
+     if scan.start_date is not None:
+-        parts.append(u"initiated %s" % scan.start_date.strftime(
++        parts.append("initiated %s" % scan.start_date.strftime(
+             "%a %b %d %H:%M:%S %Y"))
+     if scan.args is not None:
+-        parts.append(u"as: %s" % scan.args)
+-    return u" ".join(parts)
++        parts.append("as: %s" % scan.args)
++    return " ".join(parts)
+ 
+ 
+ def print_script_result_diffs_text(title, script_results_a, script_results_b,
+         script_result_diffs, f=sys.stdout):
+-    table = Table(u"*")
++    table = Table("*")
+     for sr_diff in script_result_diffs:
+         sr_diff.append_to_port_table(table)
+     if len(table) > 0:
+-        print >> f
++        print(file=f)
+         if len(script_results_b) == 0:
+-            print >> f, u"-%s:" % title
++            print("-%s:" % title, file=f)
+         elif len(script_results_a) == 0:
+-            print >> f, u"+%s:" % title
++            print("+%s:" % title, file=f)
+         else:
+-            print >> f, u" %s:" % title
+-        print >> f, table
++            print(" %s:" % title, file=f)
++        print(table, file=f)
+ 
+ 
+ def script_result_diffs_to_dom_fragment(elem, script_results_a,
+@@ -489,13 +489,13 @@
+     if len(script_results_a) == 0 and len(script_results_b) == 0:
+         return document.createDocumentFragment()
+     elif len(script_results_b) == 0:
+-        a_elem = document.createElement(u"a")
++        a_elem = document.createElement("a")
+         for sr in script_results_a:
+             elem.appendChild(sr.to_dom_fragment(document))
+         a_elem.appendChild(elem)
+         return a_elem
+     elif len(script_results_a) == 0:
+-        b_elem = document.createElement(u"b")
++        b_elem = document.createElement("b")
+         for sr in script_results_b:
+             elem.appendChild(sr.to_dom_fragment(document))
+         b_elem.appendChild(elem)
+@@ -580,10 +580,10 @@
+         banner_a = format_banner(self.scan_a)
+         banner_b = format_banner(self.scan_b)
+         if banner_a != banner_b:
+-            print >> self.f, u"-%s" % banner_a
+-            print >> self.f, u"+%s" % banner_b
++            print("-%s" % banner_a, file=self.f)
++            print("+%s" % banner_b, file=self.f)
+         elif verbose:
+-            print >> self.f, u" %s" % banner_a
++            print(" %s" % banner_a, file=self.f)
+ 
+     def output_pre_scripts(self, pre_script_result_diffs):
+         print_script_result_diffs_text("Pre-scan script results",
+@@ -596,7 +596,7 @@
+             post_script_result_diffs, self.f)
+ 
+     def output_host_diff(self, h_diff):
+-        print >> self.f
++        print(file=self.f)
+         h_diff.print_text(self.f)
+ 
+     def output_ending(self):
+@@ -621,8 +621,8 @@
+ 
+     def output_beginning(self):
+         self.writer.startDocument()
+-        self.writer.startElement(u"nmapdiff", {u"version": NDIFF_XML_VERSION})
+-        self.writer.startElement(u"scandiff", {})
++        self.writer.startElement("nmapdiff", {"version": NDIFF_XML_VERSION})
++        self.writer.startElement("scandiff", {})
+ 
+         if self.nmaprun_differs():
+             self.writer.frag_a(
+@@ -635,7 +635,7 @@
+ 
+     def output_pre_scripts(self, pre_script_result_diffs):
+         if len(pre_script_result_diffs) > 0 or verbose:
+-            prescript_elem = self.document.createElement(u"prescript")
++            prescript_elem = self.document.createElement("prescript")
+             frag = script_result_diffs_to_dom_fragment(
+                 prescript_elem, self.scan_a.pre_script_results,
+                 self.scan_b.pre_script_results, pre_script_result_diffs,
+@@ -645,7 +645,7 @@
+ 
+     def output_post_scripts(self, post_script_result_diffs):
+         if len(post_script_result_diffs) > 0 or verbose:
+-            postscript_elem = self.document.createElement(u"postscript")
++            postscript_elem = self.document.createElement("postscript")
+             frag = script_result_diffs_to_dom_fragment(
+                 postscript_elem, self.scan_a.post_script_results,
+                 self.scan_b.post_script_results, post_script_result_diffs,
+@@ -659,8 +659,8 @@
+         frag.unlink()
+ 
+     def output_ending(self):
+-        self.writer.endElement(u"scandiff")
+-        self.writer.endElement(u"nmapdiff")
++        self.writer.endElement("scandiff")
++        self.writer.endElement("nmapdiff")
+         self.writer.endDocument()
+ 
+ 
+@@ -718,9 +718,9 @@
+         self.cost += os_cost
+ 
+         extraports_a = tuple((count, state)
+-                for (state, count) in self.host_a.extraports.items())
++                for (state, count) in list(self.host_a.extraports.items()))
+         extraports_b = tuple((count, state)
+-                for (state, count) in self.host_b.extraports.items())
++                for (state, count) in list(self.host_b.extraports.items()))
+         if extraports_a != extraports_b:
+             self.extraports_changed = True
+             self.cost += 1
+@@ -746,69 +746,69 @@
+         # Names and addresses.
+         if self.id_changed:
+             if host_a.state is not None:
+-                print >> f, u"-%s:" % host_a.format_name()
++                print("-%s:" % host_a.format_name(), file=f)
+             if self.host_b.state is not None:
+-                print >> f, u"+%s:" % host_b.format_name()
++                print("+%s:" % host_b.format_name(), file=f)
+         else:
+-            print >> f, u" %s:" % host_a.format_name()
++            print(" %s:" % host_a.format_name(), file=f)
+ 
+         # State.
+         if self.state_changed:
+             if host_a.state is not None:
+-                print >> f, u"-Host is %s." % host_a.state
++                print("-Host is %s." % host_a.state, file=f)
+             if host_b.state is not None:
+-                print >> f, u"+Host is %s." % host_b.state
++                print("+Host is %s." % host_b.state, file=f)
+         elif verbose:
+-            print >> f, u" Host is %s." % host_b.state
++            print(" Host is %s." % host_b.state, file=f)
+ 
+         # Extraports.
+         if self.extraports_changed:
+             if len(host_a.extraports) > 0:
+-                print >> f, u"-Not shown: %s" % host_a.extraports_string()
++                print("-Not shown: %s" % host_a.extraports_string(), file=f)
+             if len(host_b.extraports) > 0:
+-                print >> f, u"+Not shown: %s" % host_b.extraports_string()
++                print("+Not shown: %s" % host_b.extraports_string(), file=f)
+         elif verbose:
+             if len(host_a.extraports) > 0:
+-                print >> f, u" Not shown: %s" % host_a.extraports_string()
++                print(" Not shown: %s" % host_a.extraports_string(), file=f)
+ 
+         # Port table.
+-        port_table = Table(u"** * * *")
++        port_table = Table("** * * *")
+         if host_a.state is None:
+-            mark = u"+"
++            mark = "+"
+         elif host_b.state is None:
+-            mark = u"-"
++            mark = "-"
+         else:
+-            mark = u" "
+-        port_table.append((mark, u"PORT", u"STATE", u"SERVICE", u"VERSION"))
++            mark = " "
++        port_table.append((mark, "PORT", "STATE", "SERVICE", "VERSION"))
+ 
+         for port in self.ports:
+             port_diff = self.port_diffs[port]
+             port_diff.append_to_port_table(port_table, host_a, host_b)
+ 
+         if len(port_table) > 1:
+-            print >> f, port_table
++            print(port_table, file=f)
+ 
+         # OS changes.
+         if self.os_changed or verbose:
+             if len(host_a.os) > 0:
+                 if len(host_b.os) > 0:
+-                    print >> f, u" OS details:"
++                    print(" OS details:", file=f)
+                 else:
+-                    print >> f, u"-OS details:"
++                    print("-OS details:", file=f)
+             elif len(host_b.os) > 0:
+-                print >> f, u"+OS details:"
++                print("+OS details:", file=f)
+             # os_diffs is a list of 5-tuples returned by
+             # difflib.SequenceMatcher.
+             for op, i1, i2, j1, j2 in self.os_diffs:
+                 if op == "replace" or op == "delete":
+                     for i in range(i1, i2):
+-                        print >> f, "-  %s" % host_a.os[i]
++                        print("-  %s" % host_a.os[i], file=f)
+                 if op == "replace" or op == "insert":
+                     for i in range(j1, j2):
+-                        print >> f, "+  %s" % host_b.os[i]
++                        print("+  %s" % host_b.os[i], file=f)
+                 if op == "equal":
+                     for i in range(i1, i2):
+-                        print >> f, "   %s" % host_a.os[i]
++                        print("   %s" % host_a.os[i], file=f)
+ 
+         print_script_result_diffs_text("Host script results",
+             host_a.script_results, host_b.script_results,
+@@ -819,32 +819,32 @@
+         host_b = self.host_b
+ 
+         frag = document.createDocumentFragment()
+-        hostdiff_elem = document.createElement(u"hostdiff")
++        hostdiff_elem = document.createElement("hostdiff")
+         frag.appendChild(hostdiff_elem)
+ 
+         if host_a.state is None or host_b.state is None:
+             # The host is missing in one scan. Output the whole thing.
+             if host_a.state is not None:
+-                a_elem = document.createElement(u"a")
++                a_elem = document.createElement("a")
+                 a_elem.appendChild(host_a.to_dom_fragment(document))
+                 hostdiff_elem.appendChild(a_elem)
+             elif host_b.state is not None:
+-                b_elem = document.createElement(u"b")
++                b_elem = document.createElement("b")
+                 b_elem.appendChild(host_b.to_dom_fragment(document))
+                 hostdiff_elem.appendChild(b_elem)
+             return frag
+ 
+-        host_elem = document.createElement(u"host")
++        host_elem = document.createElement("host")
+ 
+         # State.
+         if host_a.state == host_b.state:
+             if verbose:
+                 host_elem.appendChild(host_a.state_to_dom_fragment(document))
+         else:
+-            a_elem = document.createElement(u"a")
++            a_elem = document.createElement("a")
+             a_elem.appendChild(host_a.state_to_dom_fragment(document))
+             host_elem.appendChild(a_elem)
+-            b_elem = document.createElement(u"b")
++            b_elem = document.createElement("b")
+             b_elem.appendChild(host_b.state_to_dom_fragment(document))
+             host_elem.appendChild(b_elem)
+ 
+@@ -853,31 +853,31 @@
+         addrset_b = set(host_b.addresses)
+         for addr in sorted(addrset_a.intersection(addrset_b)):
+             host_elem.appendChild(addr.to_dom_fragment(document))
+-        a_elem = document.createElement(u"a")
++        a_elem = document.createElement("a")
+         for addr in sorted(addrset_a - addrset_b):
+             a_elem.appendChild(addr.to_dom_fragment(document))
+         if a_elem.hasChildNodes():
+             host_elem.appendChild(a_elem)
+-        b_elem = document.createElement(u"b")
++        b_elem = document.createElement("b")
+         for addr in sorted(addrset_b - addrset_a):
+             b_elem.appendChild(addr.to_dom_fragment(document))
+         if b_elem.hasChildNodes():
+             host_elem.appendChild(b_elem)
+ 
+         # Host names.
+-        hostnames_elem = document.createElement(u"hostnames")
++        hostnames_elem = document.createElement("hostnames")
+         hostnameset_a = set(host_a.hostnames)
+         hostnameset_b = set(host_b.hostnames)
+         for hostname in sorted(hostnameset_a.intersection(hostnameset_b)):
+             hostnames_elem.appendChild(
+                     host_a.hostname_to_dom_fragment(document, hostname))
+-        a_elem = document.createElement(u"a")
++        a_elem = document.createElement("a")
+         for hostname in sorted(hostnameset_a - hostnameset_b):
+             a_elem.appendChild(
+                     host_a.hostname_to_dom_fragment(document, hostname))
+         if a_elem.hasChildNodes():
+             hostnames_elem.appendChild(a_elem)
+-        b_elem = document.createElement(u"b")
++        b_elem = document.createElement("b")
+         for hostname in sorted(hostnameset_b - hostnameset_a):
+             b_elem.appendChild(
+                     host_b.hostname_to_dom_fragment(document, hostname))
+@@ -886,15 +886,15 @@
+         if hostnames_elem.hasChildNodes():
+             host_elem.appendChild(hostnames_elem)
+ 
+-        ports_elem = document.createElement(u"ports")
++        ports_elem = document.createElement("ports")
+         # Extraports.
+         if host_a.extraports == host_b.extraports:
+             ports_elem.appendChild(host_a.extraports_to_dom_fragment(document))
+         else:
+-            a_elem = document.createElement(u"a")
++            a_elem = document.createElement("a")
+             a_elem.appendChild(host_a.extraports_to_dom_fragment(document))
+             ports_elem.appendChild(a_elem)
+-            b_elem = document.createElement(u"b")
++            b_elem = document.createElement("b")
+             b_elem.appendChild(host_b.extraports_to_dom_fragment(document))
+             ports_elem.appendChild(b_elem)
+         # Port list.
+@@ -910,18 +910,18 @@
+ 
+         # OS changes.
+         if self.os_changed or verbose:
+-            os_elem = document.createElement(u"os")
++            os_elem = document.createElement("os")
+             # os_diffs is a list of 5-tuples returned by
+             # difflib.SequenceMatcher.
+             for op, i1, i2, j1, j2 in self.os_diffs:
+                 if op == "replace" or op == "delete":
+-                    a_elem = document.createElement(u"a")
++                    a_elem = document.createElement("a")
+                     for i in range(i1, i2):
+                         a_elem.appendChild(host_a.os_to_dom_fragment(
+                             document, host_a.os[i]))
+                     os_elem.appendChild(a_elem)
+                 if op == "replace" or op == "insert":
+-                    b_elem = document.createElement(u"b")
++                    b_elem = document.createElement("b")
+                     for i in range(j1, j2):
+                         b_elem.appendChild(host_b.os_to_dom_fragment(
+                             document, host_b.os[i]))
+@@ -935,7 +935,7 @@
+ 
+         # Host script changes.
+         if len(self.script_result_diffs) > 0 or verbose:
+-            hostscript_elem = document.createElement(u"hostscript")
++            hostscript_elem = document.createElement("hostscript")
+             host_elem.appendChild(script_result_diffs_to_dom_fragment(
+                 hostscript_elem, host_a.script_results,
+                 host_b.script_results, self.script_result_diffs,
+@@ -988,38 +988,38 @@
+             self.port_b.service.version_string()]
+         if a_columns == b_columns:
+             if verbose or self.script_result_diffs > 0:
+-                table.append([u" "] + a_columns)
++                table.append([" "] + a_columns)
+         else:
+             if not host_a.is_extraports(self.port_a.state):
+-                table.append([u"-"] + a_columns)
++                table.append(["-"] + a_columns)
+             if not host_b.is_extraports(self.port_b.state):
+-                table.append([u"+"] + b_columns)
++                table.append(["+"] + b_columns)
+ 
+         for sr_diff in self.script_result_diffs:
+             sr_diff.append_to_port_table(table)
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+-        portdiff_elem = document.createElement(u"portdiff")
++        portdiff_elem = document.createElement("portdiff")
+         frag.appendChild(portdiff_elem)
+         if (self.port_a.spec == self.port_b.spec and
+                 self.port_a.state == self.port_b.state):
+-            port_elem = document.createElement(u"port")
+-            port_elem.setAttribute(u"portid", unicode(self.port_a.spec[0]))
+-            port_elem.setAttribute(u"protocol", self.port_a.spec[1])
++            port_elem = document.createElement("port")
++            port_elem.setAttribute("portid", str(self.port_a.spec[0]))
++            port_elem.setAttribute("protocol", self.port_a.spec[1])
+             if self.port_a.state is not None:
+-                state_elem = document.createElement(u"state")
+-                state_elem.setAttribute(u"state", self.port_a.state)
++                state_elem = document.createElement("state")
++                state_elem.setAttribute("state", self.port_a.state)
+                 port_elem.appendChild(state_elem)
+             if self.port_a.service == self.port_b.service:
+                 port_elem.appendChild(
+                         self.port_a.service.to_dom_fragment(document))
+             else:
+-                a_elem = document.createElement(u"a")
++                a_elem = document.createElement("a")
+                 a_elem.appendChild(
+                         self.port_a.service.to_dom_fragment(document))
+                 port_elem.appendChild(a_elem)
+-                b_elem = document.createElement(u"b")
++                b_elem = document.createElement("b")
+                 b_elem.appendChild(
+                         self.port_b.service.to_dom_fragment(document))
+                 port_elem.appendChild(b_elem)
+@@ -1027,10 +1027,10 @@
+                 port_elem.appendChild(sr_diff.to_dom_fragment(document))
+             portdiff_elem.appendChild(port_elem)
+         else:
+-            a_elem = document.createElement(u"a")
++            a_elem = document.createElement("a")
+             a_elem.appendChild(self.port_a.to_dom_fragment(document))
+             portdiff_elem.appendChild(a_elem)
+-            b_elem = document.createElement(u"b")
++            b_elem = document.createElement("b")
+             b_elem.appendChild(self.port_b.to_dom_fragment(document))
+             portdiff_elem.appendChild(b_elem)
+ 
+@@ -1085,13 +1085,13 @@
+             for op, i1, i2, j1, j2 in diffs.get_opcodes():
+                 if op == "replace" or op == "delete":
+                     for k in range(i1, i2):
+-                        table.append_raw(u"-" + a_lines[k])
++                        table.append_raw("-" + a_lines[k])
+                 if op == "replace" or op == "insert":
+                     for k in range(j1, j2):
+-                        table.append_raw(u"+" + b_lines[k])
++                        table.append_raw("+" + b_lines[k])
+                 if op == "equal":
+                     for k in range(i1, i2):
+-                        table.append_raw(u" " + a_lines[k])
++                        table.append_raw(" " + a_lines[k])
+ 
+     def to_dom_fragment(self, document):
+         frag = document.createDocumentFragment()
+@@ -1101,11 +1101,11 @@
+             frag.appendChild(self.sr_a.to_dom_fragment(document))
+         else:
+             if self.sr_a is not None:
+-                a_elem = document.createElement(u"a")
++                a_elem = document.createElement("a")
+                 a_elem.appendChild(self.sr_a.to_dom_fragment(document))
+                 frag.appendChild(a_elem)
+             if self.sr_b is not None:
+-                b_elem = document.createElement(u"b")
++                b_elem = document.createElement("b")
+                 b_elem.appendChild(self.sr_b.to_dom_fragment(document))
+                 frag.appendChild(b_elem)
+         return frag
+@@ -1119,7 +1119,7 @@
+         copied to the output."""
+         self.widths = []
+         self.rows = []
+-        self.prefix = u""
++        self.prefix = ""
+         self.padding = []
+         j = 0
+         while j < len(template) and template[j] != "*":
+@@ -1144,7 +1144,7 @@
+ 
+         for i in range(len(row)):
+             if row[i] is None:
+-                s = u""
++                s = ""
+             else:
+                 s = str(row[i])
+             if i == len(self.widths):
+@@ -1166,7 +1166,7 @@
+         for row in self.rows:
+             parts = [self.prefix]
+             i = 0
+-            if isinstance(row, basestring):
++            if isinstance(row, str):
+                 # A raw string.
+                 lines.append(row)
+             else:
+@@ -1175,13 +1175,13 @@
+                     if i < len(self.padding):
+                         parts.append(self.padding[i])
+                     i += 1
+-                lines.append(u"".join(parts).rstrip())
+-        return u"\n".join(lines)
++                lines.append("".join(parts).rstrip())
++        return "\n".join(lines)
+ 
+ 
+ def warn(str):
+     """Print a warning to stderr."""
+-    print >> sys.stderr, str
++    print(str, file=sys.stderr)
+ 
+ 
+ class NmapContentHandler(xml.sax.handler.ContentHandler):
+@@ -1201,24 +1201,24 @@
+         self.skip_over = False
+ 
+         self._start_elem_handlers = {
+-            u"nmaprun": self._start_nmaprun,
+-            u"host": self._start_host,
+-            u"hosthint": self._start_hosthint,
+-            u"status": self._start_status,
+-            u"address": self._start_address,
+-            u"hostname": self._start_hostname,
+-            u"extraports": self._start_extraports,
+-            u"port": self._start_port,
+-            u"state": self._start_state,
+-            u"service": self._start_service,
+-            u"script": self._start_script,
+-            u"osmatch": self._start_osmatch,
+-            u"finished": self._start_finished,
++            "nmaprun": self._start_nmaprun,
++            "host": self._start_host,
++            "hosthint": self._start_hosthint,
++            "status": self._start_status,
++            "address": self._start_address,
++            "hostname": self._start_hostname,
++            "extraports": self._start_extraports,
++            "port": self._start_port,
++            "state": self._start_state,
++            "service": self._start_service,
++            "script": self._start_script,
++            "osmatch": self._start_osmatch,
++            "finished": self._start_finished,
+         }
+         self._end_elem_handlers = {
+-            u'host': self._end_host,
+-            u"hosthint": self._end_hosthint,
+-            u'port': self._end_port,
++            'host': self._end_host,
++            "hosthint": self._end_hosthint,
++            'port': self._end_port,
+         }
+ 
+     def parent_element(self):
+@@ -1248,72 +1248,72 @@
+     def _start_nmaprun(self, name, attrs):
+         assert self.parent_element() is None
+         if "start" in attrs:
+-            start_timestamp = int(attrs.get(u"start"))
++            start_timestamp = int(attrs.get("start"))
+             self.scan.start_date = datetime.datetime.fromtimestamp(
+                     start_timestamp)
+-        self.scan.scanner = attrs.get(u"scanner")
+-        self.scan.args = attrs.get(u"args")
+-        self.scan.version = attrs.get(u"version")
++        self.scan.scanner = attrs.get("scanner")
++        self.scan.args = attrs.get("args")
++        self.scan.version = attrs.get("version")
+ 
+     def _start_host(self, name, attrs):
+-        assert self.parent_element() == u"nmaprun"
++        assert self.parent_element() == "nmaprun"
+         self.current_host = Host()
+         self.scan.hosts.append(self.current_host)
+ 
+     def _start_hosthint(self, name, attrs):
+-        assert self.parent_element() == u"nmaprun"
++        assert self.parent_element() == "nmaprun"
+         self.skip_over = True
+ 
+     def _start_status(self, name, attrs):
+-        assert self.parent_element() == u"host"
++        assert self.parent_element() == "host"
+         assert self.current_host is not None
+-        state = attrs.get(u"state")
++        state = attrs.get("state")
+         if state is None:
+-            warn(u'%s element of host %s is missing the "state" attribute; '
+-                    'assuming \unknown.' % (
++            warn('%s element of host %s is missing the "state" attribute; '
++                    'assuming \unknown.' % (
+                         name, self.current_host.format_name()))
+             return
+         self.current_host.state = state
+ 
+     def _start_address(self, name, attrs):
+-        assert self.parent_element() == u"host"
++        assert self.parent_element() == "host"
+         assert self.current_host is not None
+-        addr = attrs.get(u"addr")
++        addr = attrs.get("addr")
+         if addr is None:
+-            warn(u'%s element of host %s is missing the "addr" '
++            warn('%s element of host %s is missing the "addr" '
+                     'attribute; skipping.' % (
+                         name, self.current_host.format_name()))
+             return
+-        addrtype = attrs.get(u"addrtype", u"ipv4")
++        addrtype = attrs.get("addrtype", "ipv4")
+         self.current_host.add_address(Address.new(addrtype, addr))
+ 
+     def _start_hostname(self, name, attrs):
+-        assert self.parent_element() == u"hostnames"
++        assert self.parent_element() == "hostnames"
+         assert self.current_host is not None
+-        hostname = attrs.get(u"name")
++        hostname = attrs.get("name")
+         if hostname is None:
+-            warn(u'%s element of host %s is missing the "name" '
++            warn('%s element of host %s is missing the "name" '
+                     'attribute; skipping.' % (
+                         name, self.current_host.format_name()))
+             return
+         self.current_host.add_hostname(hostname)
+ 
+     def _start_extraports(self, name, attrs):
+-        assert self.parent_element() == u"ports"
++        assert self.parent_element() == "ports"
+         assert self.current_host is not None
+-        state = attrs.get(u"state")
++        state = attrs.get("state")
+         if state is None:
+-            warn(u'%s element of host %s is missing the "state" '
++            warn('%s element of host %s is missing the "state" '
+                     'attribute; assuming "unknown".' % (
+                         name, self.current_host.format_name()))
+             state = None
+         if state in self.current_host.extraports:
+-            warn(u'Duplicate extraports state "%s" in host %s.' % (
++            warn('Duplicate extraports state "%s" in host %s.' % (
+                 state, self.current_host.format_name()))
+ 
+-        count = attrs.get(u"count")
++        count = attrs.get("count")
+         if count is None:
+-            warn(u'%s element of host %s is missing the "count" '
++            warn('%s element of host %s is missing the "count" '
+                     'attribute; assuming 0.' % (
+                         name, self.current_host.format_name()))
+             count = 0
+@@ -1321,99 +1321,99 @@
+             try:
+                 count = int(count)
+             except ValueError:
+-                warn(u"Can't convert extraports count "%s" "
++                warn("Can't convert extraports count "%s" "
+                         "to an integer in host %s; assuming 0." % (
+-                            attrs[u"count"], self.current_host.format_name()))
++                            attrs["count"], self.current_host.format_name()))
+                 count = 0
+         self.current_host.extraports[state] = count
+ 
+     def _start_port(self, name, attrs):
+-        assert self.parent_element() == u"ports"
++        assert self.parent_element() == "ports"
+         assert self.current_host is not None
+-        portid_str = attrs.get(u"portid")
++        portid_str = attrs.get("portid")
+         if portid_str is None:
+-            warn(u'%s element of host %s missing the "portid" '
++            warn('%s element of host %s missing the "portid" '
+                     'attribute; skipping.' % (
+                         name, self.current_host.format_name()))
+             return
+         try:
+             portid = int(portid_str)
+         except ValueError:
+-            warn(u"Can't convert portid "%s" to an integer "
++            warn("Can't convert portid "%s" to an integer "
+                     "in host %s; skipping port." % (
+                         portid_str, self.current_host.format_name()))
+             return
+-        protocol = attrs.get(u"protocol")
++        protocol = attrs.get("protocol")
+         if protocol is None:
+-            warn(u'%s element of host %s missing the "protocol" '
++            warn('%s element of host %s missing the "protocol" '
+                     'attribute; skipping.' % (
+                         name, self.current_host.format_name()))
+             return
+         self.current_port = Port((portid, protocol))
+ 
+     def _start_state(self, name, attrs):
+-        assert self.parent_element() == u"port"
++        assert self.parent_element() == "port"
+         assert self.current_host is not None
+         if self.current_port is None:
+             return
+         if "state" not in attrs:
+-            warn(u'%s element of port %s is missing the "state" '
++            warn('%s element of port %s is missing the "state" '
+                     'attribute; assuming "unknown".' % (
+                         name, self.current_port.spec_string()))
+             return
+-        self.current_port.state = attrs[u"state"]
++        self.current_port.state = attrs["state"]
+         self.current_host.add_port(self.current_port)
+ 
+     def _start_service(self, name, attrs):
+-        assert self.parent_element() == u"port"
++        assert self.parent_element() == "port"
+         assert self.current_host is not None
+         if self.current_port is None:
+             return
+-        self.current_port.service.name = attrs.get(u"name")
+-        self.current_port.service.product = attrs.get(u"product")
+-        self.current_port.service.version = attrs.get(u"version")
+-        self.current_port.service.extrainfo = attrs.get(u"extrainfo")
+-        self.current_port.service.tunnel = attrs.get(u"tunnel")
++        self.current_port.service.name = attrs.get("name")
++        self.current_port.service.product = attrs.get("product")
++        self.current_port.service.version = attrs.get("version")
++        self.current_port.service.extrainfo = attrs.get("extrainfo")
++        self.current_port.service.tunnel = attrs.get("tunnel")
+ 
+     def _start_script(self, name, attrs):
+         result = ScriptResult()
+-        result.id = attrs.get(u"id")
++        result.id = attrs.get("id")
+         if result.id is None:
+-            warn(u'%s element missing the "id" attribute; skipping.' % name)
++            warn('%s element missing the "id" attribute; skipping.' % name)
+             return
+ 
+-        result.output = attrs.get(u"output")
++        result.output = attrs.get("output")
+         if result.output is None:
+-            warn(u'%s element missing the "output" attribute; skipping.'
++            warn('%s element missing the "output" attribute; skipping.'
+                     % name)
+             return
+-        if self.parent_element() == u"prescript":
++        if self.parent_element() == "prescript":
+             self.scan.pre_script_results.append(result)
+-        elif self.parent_element() == u"postscript":
++        elif self.parent_element() == "postscript":
+             self.scan.post_script_results.append(result)
+-        elif self.parent_element() == u"hostscript":
++        elif self.parent_element() == "hostscript":
+             self.current_host.script_results.append(result)
+-        elif self.parent_element() == u"port":
++        elif self.parent_element() == "port":
+             self.current_port.script_results.append(result)
+         else:
+-            warn(u"%s element not inside prescript, postscript, hostscript, "
++            warn("%s element not inside prescript, postscript, hostscript, "
+                     "or port element; ignoring." % name)
+             return
+ 
+     def _start_osmatch(self, name, attrs):
+-        assert self.parent_element() == u"os"
++        assert self.parent_element() == "os"
+         assert self.current_host is not None
+         if "name" not in attrs:
+-            warn(u'%s element of host %s is missing the "name" '
++            warn('%s element of host %s is missing the "name" '
+                     'attribute; skipping.' % (
+                         name, self.current_host.format_name()))
+             return
+-        self.current_host.os.append(attrs[u"name"])
++        self.current_host.os.append(attrs["name"])
+ 
+     def _start_finished(self, name, attrs):
+-        assert self.parent_element() == u"runstats"
++        assert self.parent_element() == "runstats"
+         if "time" in attrs:
+-            end_timestamp = int(attrs.get(u"time"))
++            end_timestamp = int(attrs.get("time"))
+             self.scan.end_date = datetime.datetime.fromtimestamp(end_timestamp)
+ 
+     def _end_host(self, name):
+@@ -1435,23 +1435,23 @@
+ 
+     def frag(self, frag):
+         for node in frag.childNodes:
+-            node.writexml(self.f, newl=u"\n")
++            node.writexml(self.f, newl="\n")
+ 
+     def frag_a(self, frag):
+-        self.startElement(u"a", {})
++        self.startElement("a", {})
+         for node in frag.childNodes:
+-            node.writexml(self.f, newl=u"\n")
+-        self.endElement(u"a")
++            node.writexml(self.f, newl="\n")
++        self.endElement("a")
+ 
+     def frag_b(self, frag):
+-        self.startElement(u"b", {})
++        self.startElement("b", {})
+         for node in frag.childNodes:
+-            node.writexml(self.f, newl=u"\n")
+-        self.endElement(u"b")
++            node.writexml(self.f, newl="\n")
++        self.endElement("b")
+ 
+ 
+ def usage():
+-    print u"""\
++    print("""\
+ Usage: %s [option] FILE1 FILE2
+ Compare two Nmap XML files and display a list of their differences.
+ Differences include host state changes, port state changes, and changes to
+@@ -1461,7 +1461,7 @@
+   -v, --verbose  also show hosts and ports that haven't changed.
+   --text         display output in text format (default)
+   --xml          display output in XML format\
+-""" % sys.argv[0]
++""" % sys.argv[0])
+ 
+ EXIT_EQUAL = 0
+ EXIT_DIFFERENT = 1
+@@ -1469,8 +1469,8 @@
+ 
+ 
+ def usage_error(msg):
+-    print >> sys.stderr, u"%s: %s" % (sys.argv[0], msg)
+-    print >> sys.stderr, u"Try '%s -h' for help." % sys.argv[0]
++    print("%s: %s" % (sys.argv[0], msg), file=sys.stderr)
++    print("Try '%s -h' for help." % sys.argv[0], file=sys.stderr)
+     sys.exit(EXIT_ERROR)
+ 
+ 
+@@ -1481,7 +1481,7 @@
+     try:
+         opts, input_filenames = getopt.gnu_getopt(
+                 sys.argv[1:], "hv", ["help", "text", "verbose", "xml"])
+-    except getopt.GetoptError, e:
++    except getopt.GetoptError as e:
+         usage_error(e.msg)
+     for o, a in opts:
+         if o == "-h" or o == "--help":
+@@ -1491,15 +1491,15 @@
+             verbose = True
+         elif o == "--text":
+             if output_format is not None and output_format != "text":
+-                usage_error(u"contradictory output format options.")
++                usage_error("contradictory output format options.")
+             output_format = "text"
+         elif o == "--xml":
+             if output_format is not None and output_format != "xml":
+-                usage_error(u"contradictory output format options.")
++                usage_error("contradictory output format options.")
+             output_format = "xml"
+ 
+     if len(input_filenames) != 2:
+-        usage_error(u"need exactly two input filenames.")
++        usage_error("need exactly two input filenames.")
+ 
+     if output_format is None:
+         output_format = "text"
+@@ -1512,8 +1512,8 @@
+         scan_a.load_from_file(filename_a)
+         scan_b = Scan()
+         scan_b.load_from_file(filename_b)
+-    except IOError, e:
+-        print >> sys.stderr, u"Can't open file: %s" % str(e)
++    except IOError as e:
++        print("Can't open file: %s" % str(e), file=sys.stderr)
+         sys.exit(EXIT_ERROR)
+ 
+     if output_format == "text":
+diff -Naur nmap-7.91.orig/ndiff/setup.py nmap-7.91/ndiff/setup.py
+--- nmap-7.91.orig/ndiff/setup.py	2019-12-30 07:46:34.000000000 +0100
++++ nmap-7.91/ndiff/setup.py	2021-05-10 20:42:23.879259251 +0200
+@@ -94,7 +94,7 @@
+         self.saved_prefix = sys.prefix
+         try:
+             distutils.command.install.install.finalize_options(self)
+-        except distutils.errors.DistutilsPlatformError, e:
++        except distutils.errors.DistutilsPlatformError as e:
+             raise distutils.errors.DistutilsPlatformError(str(e) + """
+ Installing your distribution's python-dev package may solve this problem.""")
+ 
+@@ -227,7 +227,7 @@
+         uninstaller_file.close()
+ 
+         # Set exec bit for uninstaller
+-        mode = ((os.stat(uninstaller_filename)[ST_MODE]) | 0555) & 07777
++        mode = ((os.stat(uninstaller_filename)[ST_MODE]) | 0o555) & 0o7777
+         os.chmod(uninstaller_filename, mode)
+ 
+     def write_installed_files(self):
+@@ -241,7 +241,7 @@
+         with open(INSTALLED_FILES_NAME, "w") as f:
+             for output in self.get_installed_files():
+                 assert "\n" not in output
+-                print >> f, output
++                print(output, file=f)
+ 
+ 
+ class my_uninstall(distutils.cmd.Command):
+@@ -263,7 +263,7 @@
+         # Read the list of installed files.
+         try:
+             f = open(INSTALLED_FILES_NAME, "r")
+-        except IOError, e:
++        except IOError as e:
+             if e.errno == errno.ENOENT:
+                 log.error("Couldn't open the installation record '%s'. "
+                         "Have you installed yet?" % INSTALLED_FILES_NAME)
+@@ -286,7 +286,7 @@
+             try:
+                 if not self.dry_run:
+                     os.remove(file)
+-            except OSError, e:
++            except OSError as e:
+                 log.error(str(e))
+         # Delete the directories. First reverse-sort the normalized paths by
+         # length so that child directories are deleted before their parents.
+@@ -297,16 +297,16 @@
+                 log.info("Removing the directory '%s'." % dir)
+                 if not self.dry_run:
+                     os.rmdir(dir)
+-            except OSError, e:
++            except OSError as e:
+                 if e.errno == errno.ENOTEMPTY:
+                     log.info("Directory '%s' not empty; not removing." % dir)
+                 else:
+                     log.error(str(e))
+ 
+ 
+-distutils.core.setup(name=u"ndiff", scripts=[u"scripts/ndiff"],
+-    py_modules=[u"ndiff"],
+-    data_files=[(u"share/man/man1", [u"docs/ndiff.1"])],
++distutils.core.setup(name="ndiff", scripts=["scripts/ndiff"],
++    py_modules=["ndiff"],
++    data_files=[("share/man/man1", ["docs/ndiff.1"])],
+     cmdclass={
+         "install_egg_info": null_command,
+         "install": checked_install,
-- 
2.31.1


    