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How to log the debug or info comments to the generated log file from python unit test

import unittest
import logging

class Arming(unittest.TestCase):
 def testCase1(self):
 logging.info('I told you so')
 actual = 3
 expected = 3
 self.assertEqual(actual,expected)

 def testCase2(self):
 actual = 3
 expected = 4
 testcase = "Test Case 2"
 self.assertEqual(actual,expected)

if __name__ == '__main__':
 log_file = 'Arming_Command.log'
 f = open(log_file, "w")
 runner = unittest.TextTestRunner(f,verbosity=2)
 unittest.main(testRunner=runner)
 f.close()

Getting log file

testCase1 (__main__.Arming) ... ok
testCase2 (__main__.Arming) ... FAIL

======================================================================
FAIL: testCase2 (__main__.Arming)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "C:/Users/hariom.singh/PycharmProjects/Connect_Pversion/venv/Python_Logging.py", line 15, in testCase2
 self.assertEqual(actual,expected)
AssertionError: 3 != 4

----------------------------------------------------------------------
Ran 2 tests in 0.001s

FAILED (failures=1)

logging.info('I told you so')
is missed in the log file

You failed to configure the logging module to use the specified file. You can use basicConfig for that. Code could become:

if __name__ == '__main__':
 log_file = 'Arming_Command.log'
 f = open(log_file, "w")
 logging.basicConfig(stream=f, level=logging.INFO) # use the opened file for logging
 runner = unittest.TextTestRunner(f,verbosity=2)
 unittest.main(testRunner=runner)
 f.close()