Article: How To Create Your Own Timing Context Manager

timer_class.py

from time import time


class Timer(object):
    def __init__(self, description):
        self.description = description
    def __enter__(self):
        self.start = time()
    def __exit__(self, type, value, traceback):
        self.end = time()
        print(f"{self.description}: {self.end - self.start}")


with Timer("List Comprehension Example"):
    s = [x for x in range(10_000_000)]

Consider adding blank lines[flake8].

Method definitions inside a class are surrounded by a single blank line. [PEP 8]

Thanks for your reply. Although I’m aware of these things, I won’t add them as there is a clear purpose in leaving them out: This class is embedded in some publications, which do not have proper mobile versions of their website. Therefore, it’s easier for a reader in a small device to follow if certain blank lines are omitted.

Anyway, you are right that one should stick to these code formatting guidelines in their code.