code: def get_windows_env_var(key):
      
  
      if not isinstance(key, text_type):
          raise TypeError("%r not of type %r" % (key, text_type))
  
      buf = ctypes.create_unicode_buffer(32767)
  
      stored = winapi.GetEnvironmentVariableW(key, buf, 32767)
      if stored == 0:
          raise ctypes.WinError()
      return buf[:stored]
docs: Get an env var.
  
      Raises:
          WindowsError