[英]Python logging module having a formatter causes AttributeError
我正在編寫一個終端應用程序,在傳入-v
選項之后,毫不奇怪地得到了詳細信息。 我想在終端中提供輸出,以便於測試(無論如何,當它作為cron運行時,它會被重定向到日志文件)。
但是,python logging
模塊不允許我在使用格式化程序時寫出具有相應級別的消息。 (格式化程序直接從Python Logging Cookbok復制)
此行為不僅限於Python3。 Python2.7在給定條件下引發相同的異常。
one.py
from sys import stdout
import logging
if __name__ == '__main__':
level = 20
log = logging.getLogger()
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler = logging.StreamHandler(stdout).setFormatter(formatter)
log.addHandler(handler)
log.setLevel(level)
log.info("Blah")
one.py輸出
Traceback (most recent call last):
File "/home/tlevi/PycharmProjects/untitled/main.py", line 14, in <module>
log.info("Blah")
File "/usr/lib/python3.4/logging/__init__.py", line 1279, in info
self._log(INFO, msg, args, **kwargs)
File "/usr/lib/python3.4/logging/__init__.py", line 1414, in _log
self.handle(record)
File "/usr/lib/python3.4/logging/__init__.py", line 1424, in handle
self.callHandlers(record)
File "/usr/lib/python3.4/logging/__init__.py", line 1485, in callHandlers
if record.levelno >= hdlr.level:
AttributeError: 'NoneType' object has no attribute 'level'
two.py (像魅力一樣)
from sys import stdout
import logging
if __name__ == '__main__':
level = 20
log = logging.getLogger()
handler = logging.StreamHandler(stdout)
log.addHandler(handler)
log.setLevel(level)
log.info("Blah")
two.py輸出
Blah
代替
handler = logging.StreamHandler(stdout).setFormatter(formatter)
嘗試:
handler = logging.StreamHandler(stdout)
handler.setFormatter(formatter)
發生的事情是,在第一種情況下,您將setFormatter()
的返回值分配給handler
變量,但是setFormatter()
不返回處理程序(即它返回None
)
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