是的，它会在每次调用时刷新输出。您可以在的源代码中看到
StreamHandler：
def flush(self): """ Flushes the stream. """ self.acquire() try: if self.stream and hasattr(self.stream, "flush"): self.stream.flush() finally: self.release()def emit(self, record): """ Emit a record. If a formatter is specified, it is used to format the record. The record is then written to the stream with a trailing newline. If exception information is present, it is formatted using traceback.print_exception and appended to the stream. If the stream has an 'encoding' attribute, it is used to determine how to do the output to the stream. """ try: msg = self.format(record) stream = self.stream stream.write(msg) stream.write(self.terminator) self.flush() # <--- except (KeyboardInterrupt, SystemExit): #pragma: no cover raise except: self.handleError(record)
我真的不会介意日志记录的性能，至少在分析和发现它是瓶颈之前不会。无论如何，您始终可以创建一个在每次调用时都
Handler不会执行的子类（即使如果发生严重异常/解释器崩溃，也可能会丢失大量日志）。
flush``emit
