Need some help to fix my Python Codes:

My codes:

def inverse(f): my_inverted_dict = dict() for key, value in inverse.items(): my_inverted_dict.setdefault(value, list()).append(key)

Error: AttributeError: 'function' object has no attribute 'items'

Problem 3: Compute the "inverse" of a dictionary A dictionary f can be thought of a mapping from keys to values, that is, as a one-to-many partial function f:KHV from a set K of keys to a set V of values. The domain Dom(s) CK of f is the set of keys of the dictionary f. The function f has an inverse iff (if and only if) it is one-to-one, that is, if every element of K is mapped to at most one element of V. The inverse function f- of f is defined by f-'(y) = x for every x such that x e Dom(f) and y = f(x). Write a function inverse that takes as input a dictionary f, and returns the inverse of f. If f is not one-to-one, you should raise the valueError exception. Hints: You may want to accumulate the values (the elements to which keys are mapped) into a set, to check whether f is one-to-one or not. You can raise the valueError exception via raise ValueError(). To form the result dictionary, you need all values to be hashable. Do not worry about this; Python will raise an exception if a type is not hashable