simple closure example in python

closure_example.py

class Value:
    def __init__(self, val):
        self.val = val

def invoker(x):
    def closure(y):
        print (x.val + y)
    return closure

anObject = Value(5)
f = invoker(anObject)

f(1)
anObject.val = 10
f(1)

# prints:
# 6
# 11