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Recipe 577621 revision 3 

if sys.hexversion > 0x03000000:
    import winreg
else:
    import _winreg as winreg

class Win32Environment:
    """Utility class to get/set windows environment variable"""
    
    def __init__(self, scope):
        assert scope in ('user', 'system')
        self.scope = scope
        if scope == 'user':
            self.root = winreg.HKEY_CURRENT_USER
            self.subkey = 'Environment'
        else:
            self.root = winreg.HKEY_LOCAL_MACHINE
            self.subkey = r'SYSTEM\CurrentControlSet\Control\Session Manager\Environment'
            
    def getenv(self, name):
        key = winreg.OpenKey(self.root, self.subkey, 0, winreg.KEY_READ)
        try:
            value, _ = winreg.QueryValueEx(key, name)
        except WindowsError:
            value = ''
        return value
    
    def setenv(self, name, value):
        import win32con
        from win32gui import SendMessage
        assert self.scope == 'user', 'setenv supported only for user env'
        key = winreg.OpenKey(self.root, self.subkey, 0, winreg.KEY_ALL_ACCESS)
        winreg.SetValueEx(key, name, 0, winreg.REG_EXPAND_SZ, value)
        winreg.CloseKey(key)
        SendMessage(
            win32con.HWND_BROADCAST, win32con.WM_SETTINGCHANGE, 0, self.subkey)

Diff to Previous Revision

--- revision 2 2011-03-22 23:52:05
+++ revision 3 2011-03-22 23:52:56
@@ -17,7 +17,7 @@
             self.subkey = r'SYSTEM\CurrentControlSet\Control\Session Manager\Environment'
             
     def getenv(self, name):
-        key = winreg.OpenKey(self.root, self.subkey, 0, r.KEY_READ)
+        key = winreg.OpenKey(self.root, self.subkey, 0, winreg.KEY_READ)
         try:
             value, _ = winreg.QueryValueEx(key, name)
         except WindowsError:

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