code: def get_password(self, service, username):
          
          try:
              # fetch the password
              key = self._key_for_service(service)
              hkey = winreg.OpenKey(winreg.HKEY_CURRENT_USER, key)
              password_saved = winreg.QueryValueEx(hkey, username)[0]
              password_base64 = password_saved.encode('ascii')
              # decode with base64
              password_encrypted = base64.decodestring(password_base64)
              # decrypted the password
              password = _win_crypto.decrypt(password_encrypted).decode('utf-8')
          except EnvironmentError:
              password = None
          return password
docs: Get password of the username for the service