foo decorator

return foo value

def foo(foo_return):
    def foo_decorator(func):
        def func_wrapper(name):
            if foo_return:
                return foo_return
            else:
                return func(name)
        return func_wrapper
    return foo_decorator

### use:
### @foo(None) for passing the decorated function do its job
### @foo("foobar") for returning `return "foobar"` instead of decorated function doing its job