Print time needed for code execution

python elapsed time context .md

import time
class print_time:
    def __enter__(self):
        self.time = time.time()
        return self.time
    def __exit__(self, type, value, traceback):
        time_elapsed = time.time() - self.time
        print time_elapsed

with print_time() as _:
    do_something()
# '_' holds start time