在日志文件中每一行的开头打印特定的字符串

Question

How can I setup python's module logging so that every line it prints to the file starts with a specific string?

Answer 1

You can do this via the log formatter . Here's a simple example configuring it via logging.basicConfig :

import logging
logging.basicConfig(format="Hello at %(asctime)s %(message)s: %(levelname)s")
logging.warning("world")

Answer 2

Using python logging

Formatting the Output

You can pass any variable that can be represented as a string from your program as a message to your logs. If you for example want to log the process ID along with the level and message, you can do something like this:

import logging

logging.basicConfig(format='%(process)d-%(levelname)s-%(message)s')
logging.warning('This is a Warning')

# Output:
# 18472-WARNING-This is a Warning

For further details see documentation on realpython.