This script should produce the following error:

Traceback (most recent call last):
  File "logging_test_script.py", line 70, in <module>
    testobj.main()
  File "logging_test_script.py", line 62, in main
    Logger.main_logger.info('Adding a line into {}'.format(source))
  File "/usr/lib/python3.7/logging/__init__.py", line 1378, in info
    self._log(INFO, msg, args, **kwargs)
  File "/usr/lib/python3.7/logging/__init__.py", line 1514, in _log
    self.handle(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 1524, in handle
    self.callHandlers(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 1586, in callHandlers
    hdlr.handle(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 894, in handle
    self.emit(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 1127, in emit
    StreamHandler.emit(self, record)
  File "/usr/lib/python3.7/logging/__init__.py", line 1025, in emit
    msg = self.format(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 869, in format
    return fmt.format(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 869, in format
    return fmt.format(record)
  File "/usr/lib/python3.7/logging/__init__.py", line 869, in format
    return fmt.format(record)
  [Previous line repeated 984 more times]
  File "/usr/lib/python3.7/logging/__init__.py", line 609, in format
    if self.usesTime():
  File "/usr/lib/python3.7/logging/__init__.py", line 577, in usesTime
    return self._style.usesTime()
  File "/usr/lib/python3.7/logging/__init__.py", line 419, in usesTime
    return self._fmt.find(self.asctime_search) >= 0
RecursionError: maximum recursion depth exceeded while calling a Python object