def CreatePrefixUrl(self, wildcard_suffix=None):
    prefix = StripOneSlash(self.versionless_url_string)
    if wildcard_suffix:
      prefix = (prefix, wildcard_suffix) % '%s/%s'
    return prefix
dataset/ETHPy150Open GoogleCloudPlatform/gsutil/gslib/storage_url.py/_CloudUrl.CreatePrefixUrl/swapped operands of `%`