Force Python to use/import specific version of a package.

Source - https://stackoverflow.com/questions/6445167/force-python-to-use-an-older-version-of-module-than-what-i-have-installed-now

Make sure you have the version that you need already installed.

import pkg_resources
pkg_resources.require("scikit-learn==0.24.1")

import sklearn
sklearn.__version__

Logging in Python.

Use package logging 

#Import and Configure Logger
import logging
logging.basicConfig(level=logging.INFO,format='%(asctime)s :: %(levelname)s :: %(message)s')

#Initialize logger
logger = logging.getLogger()

#Log Message
logger.info("Read {} lines from - {}".format(data_frame.shape[0],input_file))

If you want to log to both the console and a log file:

import logging
logging.root.handlers = [] #Clear Handlers

#Configure File and Stream handlers
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
    handlers=[
        logging.FileHandler("./path_to_log_file.log"),
        logging.StreamHandler()
    ]
)

Append Current datetime to file name:

from datetime import datetime, timedelta, timezone  

timezone_offset = -6.0 
tzinfo = timezone(timedelta(hours=timezone_offset))
curr_time = datetime.now(tzinfo).strftime('%Y-%m-%d-%H:%M')
out_filename = "_run_time_"+str(curr_time).replace(" ","-").replace(":",".")+".csv"
print(out_filename)