How to Create a Login System in Python?

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Creating a login system in Python involves a few steps. Here’s a basic example:

  1. Create a user database: You can create a database using SQLite or any other database management system. For simplicity, you can create a text file that contains the username and password for each user, separated by a delimiter such as a comma.
  2. Write a login function: Create a function that prompts the user to enter their username and password. The function should then check if the username and password match the ones in the user database.
  3. Implement the login function: Call the login function in your main program. If the user enters the correct username and password, they should be granted access to the system.

Here’s an example code snippet that demonstrates the above steps:

import csv

# User database
user_file = 'users.csv'

# Login function
def login():
    username = input('Enter username: ')
    password = input('Enter password: ')

    # Check if username and password match the ones in the user database
    with open(user_file, 'r') as file:
        reader = csv.reader(file)
        for row in reader:
            if row[0] == username and row[1] == password:
                print('Login successful')
                return True

    # If no match found
    print('Invalid username or password')
    return False

# Main program
if login():
    # Grant access to the system
    print('Welcome to the system')
else:
    # Exit the program
    exit()

In this example, we have used a CSV file as the user database. The login function prompts the user to enter their username and password and checks if they match the ones in the CSV file. If the login is successful, the main program grants access to the system. Otherwise, it exits the program.

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