6 examples of 'python log to stderr' in Python

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328def error(self, *args, **kwargs):
329 self._logger.error(*args, **kwargs)
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34def logging_both_to_stdout_and_stderr(self, *messages):
35 for index, msg in enumerate(messages):
36 stream = sys.stdout if index % 2 == 0 else sys.stderr
37 stream.write(msg)
64def log(msg, error=False, newline='\n'):
65 """
66 Output log message to an open log file or to StdOut
67 """
68 echo = _logEcho
69
70 if _logFile is None:
71 if error or _logEcho:
72 echo = True
73 else:
74 _logFile.write('%s%s%s' % (_logPrefix, msg, newline))
75
76 if error and _logEchoErrors:
77 sys.stderr.write('%s%s%s' % (_logPrefix, msg, newline))
78
79 if echo:
80 sys.stdout.write('%s%s%s' % (_logPrefix, msg, newline))
81 sys.stdout.flush()
30def attach_stderr(level=INFO):
31 has_stderr_handler = any(handler.name == 'stderr' for handler in root_log.handlers)
32 if not has_stderr_handler:
33 handler = StreamHandler(stderr)
34 handler.name = 'stderr'
35 if level is not None:
36 handler.setLevel(level)
37 handler.setFormatter(DEBUG_FORMATTER if level == DEBUG else INFO_FORMATTER)
38 root_log.addHandler(handler)
39 return True
40 else:
41 return False
98def log(self, level, log):
99 sys.stderr.write(level + ": " + log + "\n")
59def get_stderr_handler():
60 """
61 Get stderr handler
62 """
63 handler = logging.StreamHandler(sys.stderr)
64 handler.setLevel(logging.DEBUG)
65 formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
66 handler.setFormatter(formatter)
67 return handler

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