Python: Closure hack

closure_hack.py

# http://stackoverflow.com/a/23558809/720077
def fibonacci():
    a, b = [1], [0]

    def fibo():
        a[0], b[0] = b[0], a[0] + b[0]
        return a[0]

    return fibo


fib = fibonacci()
for _ in range(10):
    print fib(),

# 0 1 1 2 3 5 8 13 21 34