Day 76 : Python Program to Check if the Substring is Present in the Given String

 

def check_substring(main_string, substring):

    if substring in main_string:

        return True

    else:

        return False

main_string = input("Enter the main string: ")

substring = input("Enter the substring to search: ")

if check_substring(main_string, substring):

    print(f"The substring '{substring}' is present in the main string.")

else:

    print(f"The substring '{substring}' is not present in the main string.")

#source code --> clcoding.com 

Code Explanation:

def check_substring(main_string, substring):

This line defines a function called check_substring that takes two arguments:

main_string: The string in which the program will search for the substring.

substring: The smaller string that we are trying to find inside the main_string.

    if substring in main_string:

This line checks if the substring exists within the main_string using the in operator. The in operator returns True if substring is found in main_string, and False otherwise.

        return True

If the substring is found in the main_string (i.e., the condition substring in main_string evaluates to True), this line returns True to indicate that the substring exists in the main_string.

    else:

This line begins the else block. It is executed if the substring is not found in the main_string (i.e., the condition substring in main_string evaluates to False).

        return False

If the substring is not found in the main_string, this line returns False, indicating that the substring is not present in the main_string.

main_string = input("Enter the main string: ")

This line prompts the user to input the main string (the larger string) using the input() function. The entered value is stored in the variable main_string.

substring = input("Enter the substring to search: ")

This line prompts the user to input the substring (the smaller string) to search for within the main_string. The entered value is stored in the variable substring.

if check_substring(main_string, substring):

This line calls the check_substring function with main_string and substring as arguments. The function checks if the substring exists in the main_string and returns either True or False. If the function returns True, the code inside the if block is executed.

    print(f"The substring '{substring}' is present in the main string.")

If the check_substring function returns True (indicating the substring was found), this line prints a message saying that the substring is present in the main_string. The value of substring is dynamically included in the message using an f-string.

else:

This line specifies what happens if the check_substring function returns False (i.e., if the substring is not found in the main_string). The code inside this else block will execute.

    print(f"The substring '{substring}' is not present in the main string.")

If the check_substring function returns False (indicating the substring is not found), this line prints a message saying that the substring is not present in the main_string. The value of substring is included in the message using an f-string.