remove various dead version checks (closes #22349)

Patch from Thomas Kluyver.

command/build_ext.py

@@ -14,13 +14,7 @@ from distutils.extension import Extension
 from distutils.util import get_platform
 from distutils import log
 
-# this keeps compatibility from 2.3 to 2.5
-if sys.version < "2.6":
-    USER_BASE = None
-    HAS_USER_SITE = False
-else:
-    from site import USER_BASE
-    HAS_USER_SITE = True
+from site import USER_BASE
 
 if os.name == 'nt':
     from distutils.msvccompiler import get_build_version
@@ -97,14 +91,11 @@ class build_ext(Command):
          "list of SWIG command line options"),
         ('swig=', None,
          "path to the SWIG executable"),
+        ('user', None,
+         "add user include, library and rpath")
         ]
 
-    boolean_options = ['inplace', 'debug', 'force', 'swig-cpp']
-
-    if HAS_USER_SITE:
-        user_options.append(('user', None,
-                             "add user include, library and rpath"))
-        boolean_options.append('user')
+    boolean_options = ['inplace', 'debug', 'force', 'swig-cpp', 'user']
 
     help_options = [
         ('help-compiler', None,

sysconfig.py

@@ -151,10 +151,7 @@ def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
         if standard_lib:
             return os.path.join(prefix, "Lib")
         else:
-            if get_python_version() < "2.2":
-                return prefix
-            else:
-                return os.path.join(prefix, "Lib", "site-packages")
+            return os.path.join(prefix, "Lib", "site-packages")
     else:
         raise DistutilsPlatformError(
             "I don't know where Python installs its library "
@@ -244,12 +241,8 @@ def get_config_h_filename():
             inc_dir = _sys_home or project_base
     else:
         inc_dir = get_python_inc(plat_specific=1)
-    if get_python_version() < '2.2':
-        config_h = 'config.h'
-    else:
-        # The name of the config.h file changed in 2.2
-        config_h = 'pyconfig.h'
-    return os.path.join(inc_dir, config_h)
+
+    return os.path.join(inc_dir, 'pyconfig.h')
 
 
 def get_makefile_filename():
@@ -461,17 +454,6 @@ def _init_posix():
     if python_build:
         g['LDSHARED'] = g['BLDSHARED']
 
-    elif get_python_version() < '2.1':
-        # The following two branches are for 1.5.2 compatibility.
-        if sys.platform == 'aix4':          # what about AIX 3.x ?
-            # Linker script is in the config directory, not in Modules as the
-            # Makefile says.
-            python_lib = get_python_lib(standard_lib=1)
-            ld_so_aix = os.path.join(python_lib, 'config', 'ld_so_aix')
-            python_exp = os.path.join(python_lib, 'config', 'python.exp')
-
-            g['LDSHARED'] = "%s %s -bI:%s" % (ld_so_aix, g['CC'], python_exp)
-
     global _config_vars
     _config_vars = g
 

tests/test_build_ext.py

@@ -31,12 +31,11 @@ class BuildExtTestCase(TempdirManager,
         self.tmp_dir = self.mkdtemp()
         self.sys_path = sys.path, sys.path[:]
         sys.path.append(self.tmp_dir)
-        if sys.version > "2.6":
-            import site
-            self.old_user_base = site.USER_BASE
-            site.USER_BASE = self.mkdtemp()
-            from distutils.command import build_ext
-            build_ext.USER_BASE = site.USER_BASE
+        import site
+        self.old_user_base = site.USER_BASE
+        site.USER_BASE = self.mkdtemp()
+        from distutils.command import build_ext
+        build_ext.USER_BASE = site.USER_BASE
 
     def test_build_ext(self):
         global ALREADY_TESTED
@@ -84,11 +83,10 @@ class BuildExtTestCase(TempdirManager,
         support.unload('xx')
         sys.path = self.sys_path[0]
         sys.path[:] = self.sys_path[1]
-        if sys.version > "2.6":
-            import site
-            site.USER_BASE = self.old_user_base
-            from distutils.command import build_ext
-            build_ext.USER_BASE = self.old_user_base
+        import site
+        site.USER_BASE = self.old_user_base
+        from distutils.command import build_ext
+        build_ext.USER_BASE = self.old_user_base
         super(BuildExtTestCase, self).tearDown()
 
     def test_solaris_enable_shared(self):