diff --git a/src/pymod/MANIFEST.in b/src/pymod/MANIFEST.in
index ce413744..db964feb 100644
--- a/src/pymod/MANIFEST.in
+++ b/src/pymod/MANIFEST.in
@@ -1,5 +1,6 @@
 include pacparser_py.c
 include pacparser/__init__.py
+include pacparser/pactester.py
 include pacparser.h
 include pacparser.c
 include pac_utils.h
diff --git a/src/pymod/pacparser/pactester.py b/src/pymod/pacparser/pactester.py
new file mode 100644
index 00000000..ef8535fe
--- /dev/null
+++ b/src/pymod/pacparser/pactester.py
@@ -0,0 +1,203 @@
+# Copyright (C) 2007-2026 Manu Garg.
+# Author: Manu Garg <manugarg@gmail.com>
+#
+# pacparser is a library that provides methods to parse proxy auto-config
+# (PAC) files. Please read README file included with this package for more
+# information about this library.
+#
+# pacparser is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# pacparser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+# USA.
+
+"""
+Command line tool to test PAC files. It provides the same interface as the
+C pactester tool:
+
+  pactester <-p pacfile> <-u url> [-h host] [-c client_ip] [-e]
+  pactester <-p pacfile> <-f urlslist> [-c client_ip] [-e]
+"""
+
+import getopt
+import sys
+
+import pacparser
+
+PACMAX = 1024 * 1024  # Max size of the PAC script (1 MiB)
+
+PROGNAME = "pactester"
+
+def usage():
+  sys.stderr.write("\nUsage:  %s <-p pacfile> <-u url> [-h host] "
+                   "[-c client_ip] [-e]\n" % PROGNAME)
+  sys.stderr.write("        %s <-p pacfile> <-f urlslist> "
+                   "[-c client_ip] [-e]\n\n" % PROGNAME)
+  sys.stderr.write("Options:\n")
+  sys.stderr.write("  -p pacfile   : PAC file to test (specify '-' to read "
+                   "from standard input)\n")
+  sys.stderr.write("  -u url       : URL to test for\n")
+  sys.stderr.write("  -h host      : Host part of the URL\n")
+  sys.stderr.write("  -c client_ip : client IP address (as returned by "
+                   "myIpAddres() function\n")
+  sys.stderr.write("                 in PAC files), defaults to IP address "
+                   "on which it is running.\n")
+  sys.stderr.write("  -e           : Deprecated: IPv6 extensions are enabled"
+                   "by default now.\n")
+  sys.stderr.write("  -f urlslist  : a file containing list of URLs to be "
+                   "tested.\n")
+  sys.stderr.write("  -v           : print version and exit\n")
+  sys.exit(1)
+
+def get_host_from_url(url):
+  # Extract the host part of the URL, like the C pactester does. Prints an
+  # error and returns None if the URL is not in a recognized form.
+  idx = url.find(':')
+  if idx < 0 or url[idx + 1:idx + 3] != '//':
+    sys.stderr.write("pactester: Not a proper URL\n")
+    return None
+  start = idx + 3
+  if start >= len(url) or url[start] in ('/', ':'):
+    sys.stderr.write("pactester: Not a proper URL\n")
+    return None
+  for end in range(start, len(url)):
+    if url[end] in ('/', ':'):
+      break
+  else:
+    end = len(url)
+  host = url[start:end]
+  if not host:
+    sys.stderr.write("pactester: Not a proper URL\n")
+    return None
+  return host
+
+def main():
+  argv = sys.argv[1:]
+  if argv and argv[0] in ("--help", "--helpshort"):
+    usage()
+
+  pacfile = url = host = urlslist = client_ip = None
+
+  try:
+    opts, _ = getopt.getopt(argv, "evp:u:h:f:c:")
+  except getopt.GetoptError:
+    usage()
+
+  for opt, arg in opts:
+    if opt == "-v":
+      print(pacparser.version())
+      return 0
+    elif opt == "-p":
+      pacfile = arg
+    elif opt == "-u":
+      url = arg
+    elif opt == "-h":
+      host = arg
+    elif opt == "-f":
+      urlslist = arg
+    elif opt == "-c":
+      client_ip = arg
+    elif opt == "-e":
+      pass
+
+  if not pacfile:
+    sys.stderr.write("pactester: You didn't specify the PAC file\n")
+    usage()
+  if not url and not urlslist:
+    sys.stderr.write("pactester: You didn't specify the URL\n")
+    usage()
+
+  try:
+    pacparser.init()
+  except Exception:
+    sys.stderr.write("pactester: Could not initialize pacparser\n")
+    return 1
+
+  if pacfile == "-":
+    script = sys.stdin.read()
+    if len(script) > PACMAX:
+      sys.stderr.write("Input file is too big. Maximum allowed size is: %d"
+                       % PACMAX)
+      pacparser.cleanup()
+      return 1
+    try:
+      pacparser.parse_pac_string(script)
+    except Exception:
+      sys.stderr.write("pactester: Could not parse the pac script: %s\n"
+                       % script)
+      pacparser.cleanup()
+      return 1
+  else:
+    try:
+      pacparser.parse_pac_file(pacfile)
+    except Exception:
+      sys.stderr.write("pactester: Could not parse the pac file: %s\n"
+                       % pacfile)
+      pacparser.cleanup()
+      return 1
+
+  if client_ip:
+    pacparser.setmyip(client_ip)
+
+  if url:
+    if not host:
+      host = get_host_from_url(url)
+      if not host:
+        pacparser.cleanup()
+        return 1
+    try:
+      proxy = pacparser.find_proxy(url, host)
+    except Exception:
+      sys.stderr.write("pactester: Problem in finding proxy for %s.\n" % url)
+      pacparser.cleanup()
+      return 1
+    print(proxy)
+    pacparser.cleanup()
+    return 0
+
+  if urlslist:
+    try:
+      fp = open(urlslist, "r")
+    except IOError:
+      sys.stderr.write("pactester: Could not open urlslist: %s" % urlslist)
+      pacparser.cleanup()
+      return 1
+    for line in fp:
+      u = line.lstrip(" \t")
+      # Skip comment lines, echoing them as the C pactester does.
+      if u.startswith("#"):
+        sys.stdout.write(u)
+        continue
+      fields = u.split(None, 1)
+      if not fields:
+        continue
+      u = fields[0]
+      host = get_host_from_url(u)
+      if not host:
+        continue
+      try:
+        proxy = pacparser.find_proxy(u, host)
+      except Exception:
+        sys.stderr.write("pactester: Problem in finding proxy for %s.\n" % u)
+        pacparser.cleanup()
+        return 1
+      if proxy:
+        print("%s : %s" % (u, proxy))
+    fp.close()
+    pacparser.cleanup()
+    return 0
+
+  pacparser.cleanup()
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())
diff --git a/src/pymod/setup.py b/src/pymod/setup.py
index b26094c9..5fb448bf 100644
--- a/src/pymod/setup.py
+++ b/src/pymod/setup.py
@@ -274,7 +274,12 @@ def main(patched_func):
         license="LGPL",
         ext_package="pacparser",
         ext_modules=[pacparser_module],
-        py_modules=["pacparser.__init__"],
+        py_modules=["pacparser.__init__", "pacparser.pactester"],
+        entry_points={
+            "console_scripts": [
+                "pactester = pacparser.pactester:main",
+            ],
+        },
     )
 
 
diff --git a/tests/runtests.py b/tests/runtests.py
index 4c551912..d9596048 100644
--- a/tests/runtests.py
+++ b/tests/runtests.py
@@ -23,6 +23,7 @@
 import getopt
 import glob
 import os
+import subprocess
 import sys
 import tempfile
 
@@ -35,6 +36,38 @@ def module_path(tests_dir):
   
   return glob.glob(os.path.join(builddir, 'lib*%s' % py_ver))[0]
   
+def run_cli_tests(pacfile, testdata, pacparser_module_path):
+  # Run the same testdata lines through the python command line tool
+  # (python -m pacparser.pactester), the way runtests.sh does for the C
+  # pactester.
+  env = dict(os.environ)
+  env['PYTHONPATH'] = (pacparser_module_path + os.pathsep +
+                       env.get('PYTHONPATH', ''))
+  f = open(testdata)
+  for line in f:
+    comment = ''
+    if '#' in line:
+      comment = line.split('#', 1)[1]
+      line = line.split('#', 1)[0].strip()
+    if not line:
+      continue
+    if ('NO_INTERNET' in os.environ and os.environ['NO_INTERNET'] and
+        'INTERNET_REQUIRED' in comment):
+      continue
+    (params, expected_result) = line.strip().split('|')
+    cmd = [sys.executable, '-m', 'pacparser.pactester', '-p', pacfile]
+    cmd += params.split()
+    p = subprocess.run(cmd, env=env, stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE, text=True)
+    if p.returncode != 0:
+      raise Exception('CLI test failed: %s returned %d\nstdout: %s\n'
+                      'stderr: %s'
+                      % (' '.join(cmd), p.returncode, p.stdout, p.stderr))
+    if p.stdout.strip() != expected_result:
+      raise Exception('CLI test failed. Got "%s", expected "%s"'
+                      % (p.stdout.strip(), expected_result))
+  f.close()
+
 def runtests(pacfile, testdata, tests_dir):
   try:
     pacparser_module_path = module_path(tests_dir)
@@ -104,6 +137,8 @@ def runtests(pacfile, testdata, tests_dir):
     raise Exception('Logging test failed: stderr mismatch\nExpected:\n%s\nGot:\n%s' %
                     (expected_stderr, actual_stderr))
 
+  run_cli_tests(pacfile, testdata, pacparser_module_path)
+
   print('All tests were successful.')