Python clausule With and Context Managers

cheat_2.py

"""
CHEAT 2: clausule With and Context Managers

In python the with keyword is used when working with unmanaged resources (like file streams).
It is similar to the using statement in VB.NET and C#
It allows you to ensure that a resource is "cleaned up" when the code that uses it finishes running,
even if exceptions are thrown. It provides 'syntactic sugar' for try/finally blocks.

https://docs.python.org/2/whatsnew/2.6.html#pep-343-the-with-statement
"""

class Test:

    def __init__(self, name):
        self._name = name
    
    def __del__(self):
        print "Bye bye"
        
    def __enter__(self):
        print "Enter"
        return self

    def __exit__(self, type, value, traceback):
        print "Exit"

    def say_hello(self):
        print "Hello %s!" % self._name

# Test
with Test("David") as test:
    test.say_hello()
with Test("Everybody") as test:
    test.say_hello()
    
# Result
"""
Enter
Hello David!
Exit
Enter
Bye bye
Hello Everybody!
Exit
"""