human
I wrote the below code

    if isinstance(ftylist_or_function, str):
        ftylist = [ftylist_or_function]
    elif inspect.isfunction(ftylist_or_function):
        return dufunc.DUFunc(ftylist_or_function, **kws)
    elif (ftylist_or_function is not None):
        ftylist = ftylist_or_function
    def wrap(func):
        vec = Vectorize(func, **kws)
        for sig in ftylist:
            vec.add(sig)
        if (len(ftylist) > 0):
            vec.disable_compile()
        return vec.build_ufunc()
    return wrap

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def vectorize(ftylist_or_function=(), **kws):