CODEWITHSUNDEEP
pythonubuntu
dang
dang

Reputation: 2412

Python log output in a file

I have a python function which prints some lines on terminal.

Here is how I execute the function:

python3 test.py

Here is some code from the file:

column1 = "|=========="
        column2 = "|==============================================================="
        column3 = "|==================================="
        column4 = "|======================="

        print("\n"+column1+column2+column3+column4+"|")
        print("|SCRIPT ID    |SCRIPT NAME                                                       |Start Time                         |RUN ID             |")
        print(column1+column2+column3+column4+"|")

It prints the following in terminal:

|==========|===============================================================|===================================|=======================|
|SCRIPT ID    |SCRIPT NAME                                                       |Start Time                         | RUN ID             |
|==========|===============================================================|===================================|=======================|
|1         |TEST_SCRIPT                                    |2020-04-17 11:46:28.054074+05:30   |201                    |
|==========|===============================================================|===================================|=======================|

Entering - SCRIPT
     Verification Started
     Verification Completed in 0 Hours 00 Min 00.000602 sec
     Methods Execution Started
     Methods Execution Completed
EXITING - SCRIPT

I want to maintain the output of the function in a log file. So, if I run python3 test.py, it should create a file called test.py-202004171148.log in a folder called as logs storing all the output in the file.

How can I do this?

Upvotes: 4

Views: 1078

Answers (4)

Rajarishi Devarajan
Rajarishi Devarajan

Reputation: 581

Adding these few lines of code to the top of your script should redirect all output to be printed to console AND ALSO written to a file

import sys
import datetime

class Printer(object):
    def __init__(self, *files):
        self.files = files
    def write(self, obj):
        for file in self.files:
            file.write(obj)
            file.flush()
    def flush(self):
        for file in self.files:
            file.flush()

f = open(f"{__file__}-{datetime.datetime.now().strftime('%Y%m%d%H%M%S')}.log", 'w')
sys.stdout = Printer(sys.stdout, f)

#Your print statements below
print("Hello world!")

Upvotes: 1

satya
satya

Reputation: 41

save file with datetime:

import datetime
file = open(str(datetime.now().strftime('test.py-%Y%m%d%H%M%S.log')), "w")
file.write("yourlogs")
file.close()

Upvotes: 3

Bhupesh lad
Bhupesh lad

Reputation: 400

to saving file you can use:

import datetime
file = open("test.py-"+str(datetime.datetime.now().timestamp())+".log", "w")
file.write("yourlogs")
file.close()

Upvotes: 1

kichik
kichik

Reputation: 34704

You can use the logging module for that. You will have to replace print() with logging.info(), logging.warning(), or logging.error() depending on your desired log level.

import logging
from datetime import datetime
fn = datetime.now().strftime('logs/test.py-%Y%m%d%H%M%S.log')
logging.basicConfig(filename=fn, level=logging.INFO)
logging.info('Entering - SCRIPT')
logging.info('etc...')

The default format will prefix every message with the log level and logger name. If you don't want that, you can override it with format.

logging.basicConfig(filename=fn, level=logging.INFO, format='%(message)s')

Upvotes: 0

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