"""
Create a LogParser.
- :param str log_file: name of log file to parse (required!)
- :param pattern: regexp to split log lines; None (default) to return
+ :param log_file: source of log lines to parse
+ :type log_file: see arg `sources` of constructor of :py:class:`IterativeReader`
+ :param pattern: regexp to parse log lines; None (default) to return
line as they are
:type pattern: str or None (default)
"""