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Python Exercise: 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

Python: Time library

Time library provides lots of time related functions and methods and is good to know whether you're developing a website or apps and games or working with data science or trading financial markets. Time is essential in most development pursuits and Python's standard time library comes very handy for that.

Let's check out a few simple examples:

moment=time.strftime("%Y-%b-%d__%H_%M_%S",time.localtime())

import time
time_now=time.strftime("%H:%M:%S",time.localtime())
print(time_now)
date_now=time.strftime("%Y-%b-%d",time.localtime())
print(date_now)

Output:

11:36:34
2020-Nov-30