input: 
  def parse_url(url: str) -> str:
      """Parse the given URL and return a string containing the protocol, domain name, and path.
      >>> parse_url('https://www.example.com/path/to/file')
      'Protocol: https, Domain name: www.example.com, Path: /path/to/file'
      """
      import urllib.parse
  
      parsed_url = urllib.parse.urlparse(url)
  
      # Get the protocol
      protocol = parsed_url.scheme
  
      # Get the domain name
      domain_name = parsed_url.netloc
  
      # Get the path
      path = parsed_url.path
  
      return f'Protocol: {protocol}, Domain name: {domain_name}, Path: {path}'
  
  result = parse_url('https://www.example.com/path/to/file')
  print(result)
  
output:     
      import urllib.parse
  
      parsed_url = urllib.parse.urlparse(url)
  
      # Get the protocol
      protocol = parsed_url.scheme
  
      # Get the domain name
      domain_name = parsed_url.netloc
  
      # Get the path
      path = parsed_url.path
  
      return f'Protocol: {protocol}, Domain name: {domain_name}, Path: {path}'
  