6 examples of 'python log to stderr' in Python

328
def error(self, *args, **kwargs):
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    self._logger.error(*args, **kwargs)

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def logging_both_to_stdout_and_stderr(self, *messages):
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    for index, msg in enumerate(messages):
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        stream = sys.stdout if index % 2 == 0 else sys.stderr
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        stream.write(msg)

64
def log(msg, error=False, newline='\n'):
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    """
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    Output log message to an open log file or to StdOut
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    """
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    echo = _logEcho
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    if _logFile is None:
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        if error or _logEcho:
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            echo = True
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    else:
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        _logFile.write('%s%s%s' % (_logPrefix, msg, newline))
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        if error and _logEchoErrors:
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            sys.stderr.write('%s%s%s' % (_logPrefix, msg, newline))
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    if echo:
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        sys.stdout.write('%s%s%s' % (_logPrefix, msg, newline))
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        sys.stdout.flush()

30
def attach_stderr(level=INFO):
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    has_stderr_handler = any(handler.name == 'stderr' for handler in root_log.handlers)
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    if not has_stderr_handler:
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        handler = StreamHandler(stderr)
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        handler.name = 'stderr'
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        if level is not None:
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            handler.setLevel(level)
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        handler.setFormatter(DEBUG_FORMATTER if level == DEBUG else INFO_FORMATTER)
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        root_log.addHandler(handler)
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        return True
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    else:
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        return False

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def log(self, level, log):
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    sys.stderr.write(level + ": " + log + "\n")

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def get_stderr_handler():
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    """
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        Get stderr handler
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    """
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    handler = logging.StreamHandler(sys.stderr)
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    handler.setLevel(logging.DEBUG)
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    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
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    handler.setFormatter(formatter)
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    return handler