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With the help of @shadowRanger, I figured there's 2 ways to write the wrapper.

First way:

def offset_b(n, func):
    def inner_wrapper(*args):
        new_arg = (args[0], args[1]-n)
        return func(*new_arg)
    return inner_wrapper

print(offset_b(1, add)(1,2))

Because I don't HAVE to use @offset_b(0.5) before function definition, the offset_b(n, func) actually can take func. It can save one layer of wrap.

In terms of the print function, offset_b(0.5, add) gives the modified add function, then we can pass in (1,2)

2nd way (same as ShadowRanger shared):

def offset_b(n)
    def outer_wrapper(func):
        def inner_wrapper(*args)
            return func(*args)
        return inner_wrapper
    return outer_wrapper

if we call offset_b(0.5), what we get is actually wrapper function. Since how we use wrapper is func = wrapper(func) what we need to do is to get the new function by offset_b(0.5)(add) then we give (1,2) to that function, which gives us offset_b(0.5)(add)(1,2)

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