Day 63 : Python Program to Check If a String is Pangram or Not

 

import string

def is_pangram(sentence):

    """

    Check if a sentence is a pangram.

    A pangram contains every letter of the English alphabet at least once.

    Args:

        sentence (str): The input string to check.

    Returns:

        bool: True if the sentence is a pangram, False otherwise.

    """

    alphabet = set(string.ascii_lowercase)

    letters_in_sentence = set(char.lower() for char in sentence if char.isalpha())

    return alphabet <= letters_in_sentence

if __name__ == "__main__":

    input_sentence = input("Enter a sentence: ")

    if is_pangram(input_sentence):

        print("The sentence is a pangram.")

    else:

        print("The sentence is not a pangram.")

#source code --> clcoding.com 

Code Explanation:

1. Importing the string module

import string

The string module provides constants such as string.ascii_lowercase, which is a string containing all lowercase letters ('abcdefghijklmnopqrstuvwxyz').

2. Function: is_pangram

def is_pangram(sentence):

    """

    Check if a sentence is a pangram.

    A pangram contains every letter of the English alphabet at least once.

    Args:

        sentence (str): The input string to check.

    Returns:

        bool: True if the sentence is a pangram, False otherwise.

    """

    alphabet = set(string.ascii_lowercase)  # Create a set of all 26 lowercase letters

alphabet: A set containing all 26 letters of the English alphabet. Using set ensures easy comparison with the letters in the sentence.

    letters_in_sentence = set(char.lower() for char in sentence if char.isalpha())

letters_in_sentence: A set comprehension that:

Iterates over each character in the sentence.

Converts the character to lowercase using char.lower() to make the comparison case-insensitive.

Checks if the character is alphabetic (char.isalpha()) to filter out non-letter characters.

Adds valid characters to the set, automatically eliminating duplicates.

    return alphabet <= letters_in_sentence

alphabet <= letters_in_sentence: This checks if all elements of the alphabet set are present in letters_in_sentence.

<=: Subset operator. If alphabet is a subset of letters_in_sentence, the function returns True.

3. Main Execution Block

if __name__ == "__main__":

    input_sentence = input("Enter a sentence: ")

This ensures that the code runs only when executed directly (not when imported as a module).

    if is_pangram(input_sentence):

        print("The sentence is a pangram.")

    else:

        print("The sentence is not a pangram.")

Takes user input and checks if it is a pangram using the is_pangram function. Prints the result accordingly.