discovery.py 文件源码

def _add_query_parameter(url, name, value):
  """Adds a query parameter to a url.

  Replaces the current value if it already exists in the URL.

  Args:
    url: string, url to add the query parameter to.
    name: string, query parameter name.
    value: string, query parameter value.

  Returns:
    Updated query parameter. Does not update the url if value is None.
  """
  if value is None:
    return url
  else:
    parsed = list(urlparse.urlparse(url))
    q = dict(parse_qsl(parsed[4]))
    q[name] = value
    parsed[4] = urllib.urlencode(q)
    return urlparse.urlunparse(parsed)