** kwargs中的Python可调参数

Question

I have following code:

def aggregate(self, **kwargs):
    for node in self:
        for prop, val in kwargs.values():
            set_val = val(node) if callable(val) else val
            setattr(node, prop, set_val)
    return self

When i'm trying to set in **kwargs a callable variable, function throw this error:

Message: TypeError("'function' object is not iterable",)

Please help. Can't understand where the problem is
Method call are following: obj.aggregate(my_key=_test) where _test are callable

Answer 1

You're iterating .values() , where each value is a single item, but you're unpacking to two names, prop and val . The error occurs when it effectively tries to assign prop, val = _test .

Looks like you meant to iterate .items() , not .values() . That way, prop would be "my_key" , and val _test as expected.