Programming Authentication (Edexcel GCSE Computer Science)

# Set a Boolean flag to track if the username is found

found = False

# List of usernames and corresponding passwords

usernames = [

["Dave", "1"],

["Steve", "2"],

["James", "3"],

["Alice", "4"],

["Stephanie", "5"]

]

# Ask the user to input their username

user = input("Enter your username: ")

# Loop through each username in the list

for i in range(len(usernames)):

# Check if the entered username matches any in the list

if user == usernames[i][0]:

found = True # Set the flag to indicate the username is found

password = input("Enter your password: ") # Ask for the password

# Check if the entered password matches the password associated with the username

if password == usernames[i][1]:

print("Welcome")

else:

print("Wrong password")

# Check if the username was not found

if not found:

print("User not found")