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Python Programs - Conditional Statements

Validate user login credentials (hardcoded username/password) - Python Program

Example 1 :

Python 

username = input("Username: ")
password = input("Password: ")

if username == "admin" and password == "1234":
    print("Login successful")
else:
    print("Invalid credentials")

Output

 
OUTPUT  :
Username: admin
Password: 1234
Login successful

Example 2 :

Python 

def validate_login(username, password):
    """
    Validates user login credentials against hardcoded username and password.

    Args:
        username (str): The username entered by the user.
        password (str): The password entered by the user.

    Returns:
        bool: True if credentials are valid, False otherwise.
    """
    # Hardcoded username and password
    correct_username = "admin"
    correct_password = "password123"

    if username == correct_username and password == correct_password:
        return True
    else:
        return False

# Get user input
user_input_username = input("Enter username: ")
user_input_password = input("Enter password: ")

# Validate credentials and display result
if validate_login(user_input_username, user_input_password):
    print("Login successful! Welcome.")
else:
    print("Invalid username or password. Please try again.")

Output

 

Successful Login:
OUTPUT 1 :
Enter username: admin
Enter password: password123
Login successful! Welcome.


Failed Login (Incorrect Password):
OUTPUT 2 :
Enter username: admin
Enter password: wrongpassword
Invalid username or password. Please try again.


Failed Login (Incorrect Username):
OUTPUT 3 :
Enter username: user
Enter password: password123
Invalid username or password. Please try again.

Explanation

This program defines a function validate_login that takes a username and password as input. Inside this function, correct_username and correct_password are hardcoded with the expected login credentials. The function then compares the user-provided input with these hardcoded values. If both the username and password match, it returns True, indicating a successful login; otherwise, it returns False.

The main part of the program prompts the user to enter their username and password using the input() function. These inputs are then passed to the validate_login function. Based on the boolean value returned by validate_login, a message is printed to the console indicating whether the login was successful or if the credentials were invalid.

 

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