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Python: Frozensets

Python sets: Exercise-13 with Solution

Write a Python program to use of frozensets.

Note: Frozensets behave just like sets except they are immutable.

Sample Solution:

Python Code:

x = frozenset([1, 2, 3, 4, 5])
y = frozenset([3, 4, 5, 6, 7])
#use isdisjoint(). Return True if the set has no elements in common with other. 
print(x.isdisjoint(y))
#use difference(). Return a new set with elements in the set that are not in the others.
print(x.difference(y))
#new set with elements from both x and y
print(x | y)

Sample Output:

False                                                                                                         
frozenset({1, 2})                                                                                             
frozenset({1, 2, 3, 4, 5, 6, 7})  

Note:- Frozensets can be created using the function frozenset(). This datatype supports methods like copy(), difference(), intersection(), isdisjoint(), issubset(), issuperset(), symmetric_difference() and union(). Being immutable it does not have method that add or remove elements.

Pictorial Presentation:

Python Sets: Frozensets.

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Python: Tips of the Day

While-else construct:

i = 5

while i > 1:
    print("Whil-ing away!")
    i -= 1
    if i == 3:
        break
else:
    print("Finished up!")