Reindented according to new standard, without tabs.

Also added one more os2 specific piece of code, by Jeff Rush.

Lib/os.py

@@ -158,6 +158,20 @@ except NameError:
 else:
     import UserDict
 
+    if name in ('os2', ):  # Where Env Var Names Must Be UPPERCASE
+        import string
+        class _Environ(UserDict.UserDict):
+            def __init__(self, environ):
+                UserDict.UserDict.__init__(self)
+                self.data = environ
+            def __setitem__(self, key, item):
+                key = string.upper(key)
+                putenv(key, item)
+                self.data[key] = item
+            def __getitem__(self, key):
+                return self.data[string.upper(key)]
+
+    else:  # Where Env Var Names Can Be Mixed Case
         class _Environ(UserDict.UserDict):
             def __init__(self, environ):
                 UserDict.UserDict.__init__(self)