input: from typing import Tuple
  
  def parse_url(url: str) -> Tuple[str, str, str]:
      """ Parses the given URL and returns a tuple containing the protocol, domain name, and path.
      >>> parse_url('https://www.example.com/path/to/file')
      ('https', 'www.example.com', '/path/to/file')
      """
output:     protocol, rest = url.split('://', 1)
      domain, *path_parts = rest.split('/', 1)
      path = '/' + path_parts[0] if path_parts else '/'
      return (protocol, domain, path)