Chapter 9, Problem 20SA

Explanation of Solution

Sets:

• • The set is an unordered collection of unique elements.
• • The set may contain different types of data; it can be numbers, characters, strings, and also class objects.
• • In Python, “set()” method is used to create the sets.

Subset:

• • If two sets are given, then if one set contains some or all the elements of other set, then that set is called the subset of other set.
• • The “issubset()” method can be used to check whether one set is a subset of the other.

Syntax:

In Python, the method “issubset()” can be used to check subset, and it can expressed as follows:

set1.issubset(set2)

Program:

#create the set set1 with five elements

set1 = set([100, 200, 300, 400, 500])

#create the set set2 with three elements

set2 = set([200, 400, 500])

#check whether set1 is subset of set2

print('set1 is subset of set2:',set1.issubset(set2))

#check whether set2 is subset of set1

print('set2 is subset of set1:',set2.issubset(set1))

Explanation of the program:

In the above Python code,

• • The first statement is to create the set “set1” using the “set()” function; the “set1” contains “100”, “200”, “300”, “400”, and “500”.
• • The second statement is to create the set “set2” using the “set()” function; the “set2” contains “200”, “400”, and “500”.
• • The third statement is to check whether “set1” is a subset of “set2”; if the result is “true”, it means “set1” is a subset of “set2”.
• • Here, the result is “false”; thus, “set1” is not a subset of “set2”.
• • The fourth statement is to check whether “set2” is a subset of “set1”; if the result is “true”, it means “set2” is a subset of “set1”.
• • Here, the result is “true”; thus, “set2” is a subset of “set1”...