def OpenKey(self, key, sub_key):
    res = (key.value, sub_key.replace("\\", "/")) % "%s/%s"
    res = res.lower().rstrip("/")
    if not res.startswith("/"):
      res = "/" + res
    if res in self.cache[self.prefix]:
      return FakeKeyHandle(res)
    raise IOError()
dataset/ETHPy150Open google/grr/grr/client/client_actions/windows/windows_test.py/RegistryFake.OpenKey/swapped operands of `%`