Or: How to do logging the proper way. Disclaimer: I have not profiled the ideas described here yet. twisted.python.log: DEBUG, WARNING, NORMAL, IMPORTANT, CRITICAL = range(5) priorities = 'DEBUG', 'WARNING', 'NORMAL', 'IMPORTANT', 'CRITICAL' class FileLogsink: def __init__(self, fp): self.fp = fp def log(msg, category, priority): now = time.ctime(time.time()) priority = priorities[priority] self.fp.write('[%(now)s] - %(priority)s - [%(category)s] %(msg)s' % vars()) class SysLogsink: ... sink = None min_priority = WARNING min_priorities = {} def msg(msg, category=None, priority=NORMAL): if priority >= min_priorities.get(category, min_priority): sink.log(msg, category, priority) def startLogging(newSink): import sys global sink sink = newSink sys.stdout = SinkFileWrapper('stdout') sys.stderr = SinkFileWrapper('stderr') def startLoggingFile(name): startLogging(open(name, 'ab+')) class SinkFilewrapper: queued = '' def __init__(self, name): self.name = name def write(self, data): data = string.split(self.queued+data, '\n') self.queued = data[-1] for line in data[:-1]: msg(line, self.name, DEBUG) class Logsource: '''mixin for classes wanting to log. Usage: class MyLoggingClass(Logsource): logCategory = 'MyThing' def someMethod(self, foo, bar): if foo==bar: self.log("foo should not be the same as bar", WARNING) ''' logCategory = None def log(message, priority=NORMAL): msg(message, self.logCategory, priority) -- The Official Moshe Zadka FAQ: http://moshez.geek The Official Moshe Zadka FAQ For Dummies: http://moshez.org Read the FAQ