pypy-sandbox-4-pycode / demo /

Lazy functions in PyPy.
To run on top of the thunk object space with the following command-line: -o thunk

This is a typical Functional Programming Languages demo, computing the
Fibonacci sequence as nested 2-tuples.

import pprint

    from __pypy__ import lazy
except ImportError:
    print __doc__
    raise SystemExit(2)

def fibo(a, b):
    return (a, fibo(b, a + b))

fibonacci = fibo(1, 1)

pprint.pprint(fibonacci, depth=10)