Yet another function cache decorator for Django.

function_cache.py

from functools import wraps
from django.core.cache import cache


def cached(key, timeout=None):
    """Decorator to cache result of function call for timeout seconds if the
    result is not None.
    """
    def wrapper(f):
        @wraps(f)
        def wrapped(*args, **kwargs):
            result = cache.get(key)
            if result is not None:
                return result
            result = f(*args, **kwargs)
            if result is not None:
                cache.set(key, result, timeout)
            return result
        return wrapped
    return wrapper


# Example usage:


@cached('foo-data', 5)
def foo(shout):
    print('About to shout {!r}'.format(shout))
    return '{}!'.format(shout)