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  • Description

    create a function (0) that takes a function_ (1) and returns a decorator (2) that calls function_ (1) on the output of the func (3) the decorator (2) reads.

    Okay, that was confusing. We want to be able to apply a func to the output of another func, in a way that affects the func (e.g. it might be easiest to write a func using yield, but that causes issues if you want to memoize it and reuse the output)

     Code 
    def add_func(operator):
    def inner(func):
        def thingy(*args, **kwargs):
            return operator( func(*args, **kwargs))
        return thingy
    return inner
     Test Cases 
    import functools

Test.assert_equals(add_func(tuple)(range)(5),  tuple(range(5)) )

@functools.lru_cache(None)
@add_func(list)
def vals(n):
    for i in range(n):
        yield n+i


Test.assert_equals(tuple(vals(5)),  tuple(vals(5)) ) 
Test.assert_equals(vals(5),  list(range(5,10)) )
    View Run Output