code: def save(filepath=None, **kwargs):
      
      if filepath is None:
          filepath = os.path.join('.env')
  
      with open(filepath, 'wb') as file_handle:
          file_handle.writelines(
              '{0}={1}\n'.format(key.upper(), val)
              for key, val in kwargs.items()
          )
docs: Saves a list of keyword arguments as environment variables to a file.
          If no filepath given will default to the default `.env` file.