将打印重定向到日志文件 [英] redirect prints to log file

问题描述

好的.我已经完成了我的第一个python程序，它有大约1000行代码. 在开发期间，在使用os.system()运行命令之前，我放置了大量print语句 说些类似的话，

Okay. I have completed my first python program.It has around 1000 lines of code. During development I placed plenty of print statements before running a command using os.system() say something like,

print "running command",cmd
os.system(cmd)

现在我已经完成了程序.我考虑过要对它们进行注释，但是将所有这些不必要的打印(我无法删除所有print语句-因为有些为用户提供了有用的信息)重定向到日志文件中会更有用吗?任何技巧或提示.

Now I have completed the program. I thought about commenting them but redirecting all these unnecessary print (i can't remove all print statements - since some provide useful info for user) into a log file will be more useful? Any tricks or tips.

推荐答案

Python允许您捕获并分配sys.stdout(如前所述)来执行此操作:

Python lets you capture and assign sys.stdout - as mentioned - to do this:

import sys
old_stdout = sys.stdout

log_file = open("message.log","w")

sys.stdout = log_file

print "this will be written to message.log"

sys.stdout = old_stdout

log_file.close()

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