Python: Frozensets
13. Use Frozensets
Write a Python program that uses frozensets.
Note: Frozensets behave just like sets except they are immutable.
Visual Presentation:
Sample Solution:
Python Code:
# Create a frozenset 'x' with elements [1, 2, 3, 4, 5].
x = frozenset([1, 2, 3, 4, 5])
# Create a frozenset 'y' with elements [3, 4, 5, 6, 7].
y = frozenset([3, 4, 5, 6, 7])
# Use the 'isdisjoint()' method to check if 'x' and 'y' have no common elements and print the result.
# Return True if the sets have no elements in common with each other.
print(x.isdisjoint(y))
# Use the 'difference()' method to find the elements in 'x' that are not in 'y' and print the result.
# Return a new frozenset with elements in 'x' that are not in 'y'.
print(x.difference(y))
# Create a new frozenset with elements that are a union of 'x' and 'y' and print the result.
# This combines 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.
For more Practice: Solve these Related Problems:
- Write a Python program to create a frozenset from a list of numbers and demonstrate its immutability.
- Write a Python program to perform set operations (union, intersection) using frozensets.
- Write a Python program to compare a frozenset with a set for equality and membership tests.
- Write a Python program to use frozensets as dictionary keys and print the resulting dictionary.
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