Use closure for your Django context processors

Luke Plant May 15, 2015 Reply

An extra trick to use with this is to memoize the closure so that it is only called once if used multiple times. I use this decorator to convert closures into memoized ones:

    def memoize_nullary(f):
        """
        Memoizes a function that takes no arguments. The memoization lasts only as
        long as we hold a reference to the return value.
        """
        def func():
            if not hasattr(func, 'retval'):
                func.retval = f()
            return func.retval
        return func