Formats an event as a unicode, using the format in event["log_format"].

This implementation should never raise an exception; if the formatting cannot be done, the returned string will describe the event generically so that a useful message is emitted regardless.

ParameterseventA logging event. (type: dict)
ReturnsA formatted string. (type: unicode)
API Documentation for Twisted, generated by pydoctor at 2015-11-29 11:40:45.