Exam PCEP-30-02 topic 1 question 68 discussion

The code is erroneous. The error occurs in the line print(len(crates[box])). The key box is not a string but a dictionary, which is not a valid key type for a dictionary in Python. Dictionary keys must be of an immutable type, such as strings, numbers, or tuples containing only immutable types. To fix the code, you should use the string 'box' as the key instead of the dictionary box

C is correct. Dictionary keys have to be immutable, therefore you can't index a dictionary with a dictionary.

c is the correct answer