input: Write a function to parse the given URL and return the protocol, domain name, and path using Python. The function should use the urllib.parse module to split the URL into its components.
  
  def parse_url(url):
      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 {'Protocol': protocol, 'Domain name': domain_name, 'Path': path}
  
  assert parse_url('https://www.example.com/path/to/file')=={'Protocol': 'https', 'Domain name': 'www.example.com', 'Path': '/path/to/file'}
  assert parse_url('http://subdomain.example.com/another/path')=={'Protocol': 'http', 'Domain name': 'subdomain.example.com', 'Path': '/another/path'}
  assert parse_url('ftp://ftp.example.com')=={'Protocol': 'ftp', 'Domain name': 'ftp.example.com', 'Path': ''}
  assert parse_url('https://www.example.com')=={'Protocol': 'https', 'Domain name': 'www.example.com', 'Path': ''}
  assert parse_url('http://www.example.com/path/with/query?q=foo')=={'Protocol': 'http', 'Domain name': 'www.example.com', 'Path': '/path/with/query'}
output: def parse_url(url):
      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 {'Protocol': protocol, 'Domain name': domain_name, 'Path': path}