Context Manager API

context_manager_api.py

class Context(object):
    def __init__(self):
        print '__init__()'
    def __enter__(self):
        print '__enter__()'
        return self
    def __exit__(self, exc_type, exc_val, exc_tb):
        print '__exit__()'

with Context():
    print "Doing work in the context"

gistfile1.txt

__init__()
__enter__()
Doing work in the context
__exit__()