from urllib.request import urlopen

import contextlib

class MyClass1(object):

def __init__(self):

print('MyClass1.__init__()')

def __enter__(self):

print('MyClass1.__enter__()')

return self

def __exit__(self, exc_type, exc_value, traceback):

print('MyClass1.__exit__({}, {}, {})'.format(exc_type, exc_value, traceback))

if exc_type:

print('Error')

def hf1(self):

print('MyClass1.hf1()')

with MyClass1() as x1:

x1.hf1()

class MyClass2(object):

def __init__(self):

print('MyClass1.__init__()')

def hf1(self):

print('MyClass1.hf1()')

@contextlib.contextmanager

def hf1():

print('__main__.hf1() start')

x1 = MyClass2()

yield x1

print('__main__.hf1() end')

with hf1() as x1:

x1.hf1()

@contextlib.contextmanager

def hf2():

print('__main__.hf2() start')

yield

print('__main__hf2() end')

with hf2():

print('hello world')

with contextlib.closing(urlopen('https://www.python.org')) as response:

print(type(response), response.status)