diff --git a/contrib/packaging/hgpackaging/inno.py b/contrib/packaging/hgpackaging/inno.py
--- a/contrib/packaging/hgpackaging/inno.py
+++ b/contrib/packaging/hgpackaging/inno.py
@@ -19,14 +19,10 @@
     extract_tar_to_directory,
     extract_zip_to_directory,
     find_vc_runtime_files,
+    python_exe_info,
 )
 
 
-PRINT_PYTHON_INFO = '''
-import platform, sys; print("%s:%d" % (platform.architecture()[0], sys.version_info[0]))
-'''.strip()
-
-
 def build(source_dir: pathlib.Path, build_dir: pathlib.Path,
           python_exe: pathlib.Path, iscc_exe: pathlib.Path,
           version=None):
@@ -50,23 +46,18 @@
     # architecture.
     vc_x64 = r'\x64' in os.environ['LIB']
 
-    res = subprocess.run(
-        [str(python_exe), '-c', PRINT_PYTHON_INFO],
-        capture_output=True, check=True)
-
-    py_arch, py_version = res.stdout.decode('utf-8').split(':')
-    py_version = int(py_version)
+    py_info = python_exe_info(python_exe)
 
     if vc_x64:
-        if py_arch != '64bit':
+        if py_info['arch'] != '64bit':
             raise Exception('architecture mismatch: Visual C++ environment '
                             'is configured for 64-bit but Python is 32-bit')
     else:
-        if py_arch != '32bit':
+        if py_info['arch'] != '32bit':
             raise Exception('architecture mismatch: Visual C++ environment '
                             'is configured for 32-bit but Python is 64-bit')
 
-    if py_version != 2:
+    if py_info['py3']:
         raise Exception('Only Python 2 is currently supported')
 
     build_dir.mkdir(exist_ok=True)
diff --git a/contrib/packaging/hgpackaging/util.py b/contrib/packaging/hgpackaging/util.py
--- a/contrib/packaging/hgpackaging/util.py
+++ b/contrib/packaging/hgpackaging/util.py
@@ -7,8 +7,10 @@
 
 # no-check-code because Python 3 native.
 
+import distutils.version
 import os
 import pathlib
+import subprocess
 import tarfile
 import zipfile
 
@@ -46,3 +48,26 @@
         d / 'msvcr90.dll',
         winsxs / 'Manifests' / ('%s.manifest' % version),
     ]
+
+
+PRINT_PYTHON_INFO = '''
+import platform; print("%s:%s" % (platform.architecture()[0], platform.python_version()))
+'''.strip()
+
+
+def python_exe_info(python_exe: pathlib.Path):
+    """Obtain information about a Python executable."""
+
+    res = subprocess.run(
+        [str(python_exe), '-c', PRINT_PYTHON_INFO],
+        capture_output=True, check=True)
+
+    arch, version = res.stdout.decode('utf-8').split(':')
+
+    version = distutils.version.LooseVersion(version)
+
+    return {
+        'arch': arch,
+        'version': version,
+        'py3': version >= distutils.version.LooseVersion('3'),
+    }