Python contexts

demo_contexts.py

import time
from contextlib import contextmanager

@contextmanager
def do_itmer(operation_name):
	pre_time = time.time()
	yield
	post_time = time.time()
	print(f"Operation {operation_name} took {int(post_time - pre_time)} seconds")

with do_timer("Sleep and talk"):
	time.sleep(2)
	print("Hi")