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Chapter 9: Problem 2

Which part of a dictionary element must be immutable?

Short Answer

Expert verified
Answer: The KEY part of a dictionary element must be immutable.

Step by step solution

01

Understanding Python dictionary elements

A dictionary in Python is a collection of key-value pairs. Each key-value pair represents a dictionary element. The key is the identifier for the specific value that it associates within the dictionary.
02

Mutable and Immutable objects in Python

In Python, an object is either mutable or immutable. Mutable objects can be altered after they are created, while immutable objects cannot be changed once they are created. Some examples of mutable objects include lists, sets, and dictionaries, whereas some examples of immutable objects include strings, tuples, and numbers.
03

Criteria for Dictionary keys

Dictionary keys in Python must meet the following criteria: 1. They must be unique within the same dictionary. 2. They must be immutable; mutable objects cannot be used as keys, as they can be changed after they are created. This can lead to inconsistencies in the dictionary mapping.
04

Which part of the dictionary element must be immutable?

The part of a dictionary element that must be immutable is the KEY. The key is used as an identifier for the associated value, so it is crucial for the key to be consistent and unchangeable, hence it must be of an immutable object type. The VALUE can be mutable or immutable, as this does not affect the overall integrity of the dictionary.

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