Chapter 9, Problem 4TF

Explanation of Solution

Dictionary keys cannot be list:

• • In Python, a dictionary is defined as an unordered collection of data.
• • Each element of the dictionary is a key-value pair.
• • For each key, there is a value mapped to it.
• • The keys in dictionary cannot be modified but the values can be modified.
• • Keys in the dictionary must be immutable objects.
  • ○ Immutable object:
    • ■ An object that cannot be modified after its creation is the immutable object.
    • ■ Examples of immutable objects are list, array, set, and so on.
  • ○ Mutable object:
    • ■ An object that can be modified after its creation is the mutable object.
    • ■ Examples of mutable objects are integer, float, string, and so on.
• • List is a mutable object since the elements in the list can be modified.
• • Since list is mutable object, list cannot be a dictionary key.

Syntax:

In Python, the syntax to create the dictionary is as follows:

dictionary_name={key1:value1,key2:value2…}

In the above syntax,

• • A dictionary can have multiple elements...