Fix some incompatibilies with python 2.7

Issue #406

doc/changelog.rst

@@ -4,6 +4,15 @@ Release history
 py2app 0.28
 -----------
 
+* #406: Fix incompatibility with python 2.7
+
+  py2app 0.24 accidently broke compatibility with Python 2.7, and
+  this release fixes this.
+
+  This is the last release with Python 2.7 support, the next
+  release will contain package metadata that ensures it can 
+  only be installed on Python 3.
+
 * #413: Find dist-info in included pythonXX.zip
 
   By default the ``working_set`` of pkg_resources does not contain

py2app/apptemplate/lib/site.py

@@ -23,13 +23,7 @@
 USER_SITE = None
 USER_BASE = None
 
-
-def _import_os():
-    global os
-    import os  # noqa: E402
-
-
-_import_os()
+import os
 
 try:
     basestring
@@ -197,12 +191,13 @@ def getusersitepackages():
 if hasattr(sys, "setdefaultencoding"):
     del sys.setdefaultencoding
 
-import builtins  # noqa: E402
-import _sitebuiltins  # noqa: E402
+if sys.version_info[0] == 3:
+    import builtins  # noqa: E402
+    import _sitebuiltins  # noqa: E402
 
-builtins.help = _sitebuiltins._Helper()
-builtins.quit = _sitebuiltins.Quitter('quit', 'Ctrl-D (i.e. EOF)')
-builtins.exit = _sitebuiltins.Quitter('exit', 'Ctrl-D (i.e. EOF)')
+    builtins.help = _sitebuiltins._Helper()
+    builtins.quit = _sitebuiltins.Quitter('quit', 'Ctrl-D (i.e. EOF)')
+    builtins.exit = _sitebuiltins.Quitter('exit', 'Ctrl-D (i.e. EOF)')
 
 # Prefixes for site-packages; add additional prefixes like /usr/local here
 PREFIXES = [sys.prefix, sys.exec_prefix]

py2app/recipes/qt5.py

@@ -53,12 +53,15 @@ def check(cmd, mf):
             extra = {}
 
         if sys.version[0] != 2:
-            return {
+            result = {
                 "packages": ["PyQt5"],
                 "expected_missing_imports": {"copy_reg", "cStringIO", "StringIO"},
-                **extra,
             }
+            result.update(extra)
+            return result
         else:
-            return {"packages": ["PyQt5"], **extra}
+            result = {"packages": ["PyQt5"]}
+            result.update(extra)
+            return result
 
     return None

py2app/recipes/qt6.py

@@ -51,6 +51,8 @@ def check(cmd, mf):
         except ImportError:
             mf.import_hook("sip", m, level=1)
 
-        return {"packages": ["PyQt6"], **extra}
+        reslt = {"packages": ["PyQt6"] }
+        result.update(extra)
+        return result
 
     return None