log.py 文件源码

def startLoggingWithObserver(observer, setStdout=1):
    """Initialize logging to a specified observer. If setStdout is true
       (defaults to yes), also redirect sys.stdout and sys.stderr
       to the specified file.
    """
    global defaultObserver, _oldshowwarning
    if not _oldshowwarning:
        _oldshowwarning = warnings.showwarning
        warnings.showwarning = showwarning
    if defaultObserver:
        defaultObserver.stop()
        defaultObserver = None
    addObserver(observer)
    msg("Log opened.")
    if setStdout:
        sys.stdout = logfile
        sys.stderr = logerr