记录 function 在 python 中返回 object 的确切时间

Question

I have a function that creates and returns a dataframe in python:

import logging
import pandas as pd
from pandas import util 

def some_function():
    
    logging.info('creating foobar')
    foobar = util.testing.makeDataFrame()
    
    return foobar

What is the best method for logging the precise time that foobar is returned?

Answer 1

The easiest way to accomplish what you're trying to do is to just configure the logging object, like so:

import logging

logging.basicConfig(
    format="[%(asctime)s.%(msecs)03d] %(levelname)s [%(thread)d] - %(message)s", 
    level=logging.DEBUG, 
    datefmt="%Y-%m-%d %H:%M:%S",
    stream=sys.stderr
)

logging.info('creating foobar')

That way your log will automatically log the timestamp for every single log you write, and you wont need to add that in on every single log you write up.