Basic binary search with logger

bsl.py

import logging
from typing import Optional

def create_logger(logger_type=logging.DEBUG):

	logger = logging.getLogger(__name__)  
	logger.setLevel(logger_type)
	stream_handler = logging.StreamHandler()
	formatter    = logging.Formatter('%(asctime)s : %(levelname)s : %(funcName)s : %(message)s')
	stream_handler.setFormatter(formatter)
	logger.addHandler(stream_handler)

	return logger

logger = create_logger()

def binary_search(sorted_list:list, target:int) -> Optional[int]:
	''' 
	inputs: a sorted list of integers and a target integer
	returns the target integer if found or -1
	'''
	if sorted_list and sorted_list[0] <= target <= sorted_list[-1]:
		
		ptr = len(sorted_list) // 2 #integer division. 
		logger.debug(f"{sorted_list}, ptr: {ptr}, comparing {target} and {sorted_list[ptr]}")
		
		if sorted_list[ptr] > target:
			logger.debug(f"searching {target} in  {sorted_list[:ptr]}")
			return binary_search(sorted_list[:ptr], target)
		
		if sorted_list[ptr] < target:
			logger.debug(f"searching {target} in  {sorted_list[ptr:]}")
			return binary_search(sorted_list[ptr:], target)
		
		else:
			logger.debug(f"found {target}")
			return target
	else:
		return None

def main() -> None:
	logger.info(binary_search(range(20), 3))
	print(type(logger))

if __name__ == '__main__':
	main()