parameters: (date_str)
return_statement: return None
docstring: Return the epoch seconds of a date header.
  
      Args:
        date_str: a date string (e.g. "Thu, 01 Dec 1994 16:00:00 GMT")
      Returns:
        epoch seconds as a float
docstring_summary: Return the epoch seconds of a date header.
docstring_tokens: Return the epoch seconds of a date header .
function: def _get_epoch_seconds(date_str):
      """Return the epoch seconds of a date header.
  
      Args:
        date_str: a date string (e.g. "Thu, 01 Dec 1994 16:00:00 GMT")
      Returns:
        epoch seconds as a float
      """
      date_tuple = email.utils.parsedate(date_str)
      if date_tuple:
        return calendar.timegm(date_tuple)
      return None
function_tokens: def _get_epoch_seconds ( date_str ) : date_tuple = email . utils . parsedate ( date_str ) if date_tuple : return calendar . timegm ( date_tuple ) return None