Chapter 9, Problem 3TF

Explanation of Solution

Dictionary keys can be tuple:

• • 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:
    • ■ The 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:
    • ■ The object that can be modified after its creation is the mutable object.
    • ■ Examples of mutable objects are integer, float, string, and so on.
• • Tuples are immutable object that cannot be changed after its creation.
  • ○ Tuple is a sequence in which elements cannot be changed after assigned.
  • ○ Tuple is similar to list and the only difference is that list can modify the elements whereas tuple cannot modify the elements.
• • Since tuples are immutable object, tuple can be a dictionary key...