How do I make my own context manager

Question

How do I create my own context manager using python? Also why do I need a context manager?

Answer 1

Context is an opening file, catching expressions, etc. A context manager is anything that manages your context. You can use it like this:

from contextlib import contextmanager
 
def my_open(filename):
    file = open(filename)
 
    try:
        # this yield is where the body of the with statement happens
        yield file
    finally:
        file.close()