Page 291 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

ifusername!=correct_usernameorpassword!=correct_password:

raiseValueError(“Incorrect username or password.”)
exceptValueErrorase:
print(f”Authentication Error: {e}”)
else:
print(“Authentication successful.”)
Explanation:

• The program expects the user to input a username and password.
• If the entered credentials do not match the correct ones, a ValueError is raised.
• The except block catches this exception and prints an authentication error message.
• If no exception occurs, the else block executes, indicating successful authentication.

Output:

Related Exercises:
1 Write a program that tries to access an element at a specific index in a list. Handle the IndexError if the index
is out of range.

2 Create a program that concatenates two strings entered by the user. Handle the TypeError if the user enters
a non-string value
3 Write a program that asks the user to input their age. Raise a custom exception if the user enters a negative
value.
4 Create a dictionary and try to access a key that doesn’t exist. Handle the KeyError gracefully.
5 Write a program that uses assert to check whether a given number is positive. Handle the AssertionError if the
condition is not met.

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CITS : IT & ITES - Computer Software Application - Exercise 131