Context Managers: The with statement — Python Exercise

Overview

Guarantee setup and cleanup around a block of code — the same protocol that makes "with open(...)" close files for you.

__enter__ runs when the block starts
__exit__ always runs when it ends, even on errors
Returning True from __exit__ swallows the exception

Short Course

with calls __enter__ before the block and __exit__ after it, whether the block finished or raised. __exit__ receives the error, if any; returning True tells Python it was handled.

class Announce:
    def __enter__(self):
        print("start")
        return self

    def __exit__(self, exc_type, exc, tb):
        print("end")          # runs even if the block fails
        return False          # don't hide errors

with Announce():
    print("working")          # start / working / end

Task

Write a class ignore_errors(*exceptions) for use with with: any listed exception raised in the block is silently ignored; any other exception still propagates.

Test Suites Pending

Stdout