日志记录模块无法在IPython中打印 [英] Logging module does not print in IPython

问题描述

以下代码的确在"ipython qtconsole"中打印了我要打印"，但是在普通的IPython中却不打印.

The following code does print 'I want this to print' in 'ipython qtconsole', however it does not print in plain IPython.

import logging
import logging.handlers

log = logging.getLogger()
f = logging.Formatter("%(asctime)s - %(module)s.   %(funcName)s - %(levelname)s - %(message)s")
fh = logging.handlers.TimedRotatingFileHandler('log.txt', 'W6')
fh.setFormatter(f)
log.addHandler(fh)
log.setLevel(logging.INFO)
log.info('I want this to print')

但是在"IPython qtconsole"中，我遇到了不同的问题，我试图解释

In 'IPython qtconsole' however i get different problems, that i tried to explain here (which did not go so well, no need to read!).

你能告诉我为什么吗?

我使用Python 2.7

I use Python 2.7

也许我真的只需要添加logging.StreamHandler.

Maybe i really just need to add logging.StreamHandler.

推荐答案

似乎qtconsole向root记录器添加了处理程序:

It seems like qtconsole adds an handler to the root logger:

In [1]: import logging
   ...: root = logging.getLogger()
   ...: root.handlers
   ...: 
Out[1]: [<logging.StreamHandler at 0x7fd8e00e1f98>]

使用普通的python解释器或仅ipython:

While using the normal python interpreter or just ipython:

In [1]: import logging

In [2]: root = logging.getLogger()

In [3]: root.handlers
Out[3]: []

如果您希望两者的行为相同，则应将StreamHandler添加到普通ipython的根记录器中，或从qtconsole解释器中删除StreamHandler.

If you want both to behave the same you should either add a StreamHandler to the root logger for normal ipython, or remove the StreamHandler from the qtconsole interpreter.

如果希望前者只需添加:

If you want the former just add:

root = logging.getLogger()
root.addHandler(logging.StreamHandler())

如果要使用后者，请之前添加自己的处理程序，请执行以下操作:

If you want the latter, before adding your own handler, do:

for handler in root.handlers[:]:
    root.removeHandler(handler)

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请注意，IPython已经提供了一些用于登录文件的机制.请参阅文档.如果您只想在ipython内部使用代码，使用它的魔力可能会更简单.

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Note that IPython already provides some machinery for logging to a file. See the documentation. If you want to use the code only inside ipython using its magics might be simpler.

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