How to create a sign.in sign.up.interface in python.

 Hey there! Are you looking to create a simple sign-in and sign-up interface in Python? Well, you’re in the right place! In this blog, I’ll walk you through how to make a basic user authentication system that allows users to sign up and sign in using Python's built-in functions.

Before we jump into the code, let's quickly understand what sign-in and sign-up are.

  • Sign-Up: This is where a user creates a new account. They provide their details (like username and password) to register.
  • Sign-In: This is where an existing user logs in using their credentials (username and password) to access their account.

    • Tools You’ll Need:

    1. Python: We will use Python for this project.
    2. Basic Knowledge: You should already know how to write simple Python code, work with variables, and handle user input.

    let's start the coding

    Firstly, we will create a function that allows new users to sign.up by providing a username and password.
    1.First, we need to create a dictionary to store our users and their passwords. Each key in the dictionary will be a username, and the corresponding value will be the password.
    Here, we’ve initialized the dictionary with some sample users. You can later add more users dynamically through the signup process.
    In real-world applications, user data would be stored securely in databases, but for this simple project, we use a Python dictionary.

    2.User Options:

    The program gives the user two options:
    Option 1: Sign-Up – This is for creating a new account.
    Option 2: Sign-In – This is for logging into an existing account.

    3.Sign-Up Logic:

    When the user selects sign-up, the program asks for a username, password, and confirmation of the password.
    It checks if the passwords match and if the username is already taken.
    If everything is valid, it stores the new user credentials in the users dictionary.

    4.Sign-In Logic:

    When the user selects sign-in, the program asks for a username and password.
    It checks if the username exists in the dictionary and if the password matches.
    If either the username doesn't exist or the password is incorrect, it prompts the user to try again.

    Breaking Down the Flow
    Let’s visualize the steps in the program:

    Sign-Up Flow:

    The user enters a username and password.
    The system checks if the username already exists.
    If it doesn’t exist, the new user is added to the system with the username and password.
    If the password doesn’t match the confirmation, it asks the user to correct it.
    Sign-In Flow:

    The user enters their username and password.
    The system checks if the username exists in the database.
    If it exists, it checks if the password matches.
    If everything is correct, the user successfully logs in.

    HERE IS THE FINAL CODE

    CONCLUSION 
    In this blog we learnt how to create a sign.in sign.up interface in python with basic knowledge of dictionaries and conditional statements in python.


    Made by:-
    Sana,XI science 
    PM SHRI KENDRIYA VIDYALAYA SUKNA
    (Under the guidance of MR.Satyajit Roy)

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