如何编写自定义的Python日志处理程序？

如何编写自定义控制台日志function，只在控制台窗口上输出日志消息，在一行（不追加），直到第一个常规的日志logging。

progress = ProgressConsoleHandler() console = logging.StreamHandler() logger = logging.getLogger('test') logger.setLevel(logging.DEBUG) logger.addHandler(console) logger.addHandler(progress) logger.info('test1') for i in range(3): logger.progress('remaining %d seconds' % i) time.sleep(1) logger.info('test2') 

所以控制台输出只有三行：

 INFO: test1 remaining 0 seconds... INFO: test2 

有关如何实现这个最好的方法的任何build议？

Answer 1

 import logging class ProgressConsoleHandler(logging.StreamHandler): """ A handler class which allows the cursor to stay on one line for selected messages """ on_same_line = False def emit(self, record): try: msg = self.format(record) stream = self.stream same_line = hasattr(record, 'same_line') if self.on_same_line and not same_line: stream.write(self.terminator) stream.write(msg) if same_line: stream.write('... ') self.on_same_line = True else: stream.write(self.terminator) self.on_same_line = False self.flush() except (KeyboardInterrupt, SystemExit): raise except: self.handleError(record) if __name__ == '__main__': import time progress = ProgressConsoleHandler() console = logging.StreamHandler() logger = logging.getLogger('test') logger.setLevel(logging.DEBUG) logger.addHandler(progress) logger.info('test1') for i in range(3): logger.info('remaining %d seconds', i, extra={'same_line':True}) time.sleep(1) logger.info('test2') 

请注意，只有一个处理程序正在注册，而extra关键字参数让处理程序知道它应该保持在一行。 在emit()方法中有更多的逻辑来处理消息之间的变化，这些消息应该保持在一行上，而消息需要有自己的行。