Python (Kivy & KivyMD) Login, Register, and Forgot Password Forms with Responsive Design

In this tutorial, we will create a responsive form for login, register, and forget password functionalities using Python with the Kivy and KivyMD frameworks. Kivy is an open-source Python library for rapid development of multitouch applications, while KivyMD is a collection of Material Design components for Kivy.

Step 1: Setting up the environment
First, make sure you have Python installed on your machine. You can download and install Python from the official website (https://www.python.org/). Next, install Kivy and KivyMD using pip:

pip install kivy kivymd

Step 2: Create a new Python file
Create a new Python file for our project, for example, main.py, and import the required modules:

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivymd.uix.textfield import MDTextField
from kivymd.uix.button import MDFillRoundFlatIconButton, MDRoundFlatButton

Step 3: Create the login screen
In this step, we will create the login screen with username and password fields, and login button. Add the following code to the main.py file:

class LoginScreen(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        layout = BoxLayout(orientation='vertical', spacing=10)
        self.add_widget(layout)

        layout.add_widget(Label(text='Login', font_size=30))

        self.username = MDTextField(hint_text='Username', required=True)
        layout.add_widget(self.username)

        self.password = MDTextField(hint_text='Password', required=True, password=True)
        layout.add_widget(self.password)

        login_button = MDFillRoundFlatIconButton(text='Login', icon='account')
        login_button.bind(on_release=self.login)
        layout.add_widget(login_button)

    def login(self, instance):
        username = self.username.text
        password = self.password.text

        # Check username and password against database
        # If successful, navigate to home screen

Step 4: Create the register screen
Next, we will create the register screen with username, email, password, and register button. Add the following code to the main.py file:

class RegisterScreen(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        layout = BoxLayout(orientation='vertical', spacing=10)
        self.add_widget(layout)

        layout.add_widget(Label(text='Register', font_size=30))

        self.username = MDTextField(hint_text='Username', required=True)
        layout.add_widget(self.username)

        self.email = MDTextField(hint_text='Email', required=True)
        layout.add_widget(self.email)

        self.password = MDTextField(hint_text='Password', required=True, password=True)
        layout.add_widget(self.password)

        register_button = MDFillRoundFlatIconButton(text='Register', icon='account-plus')
        register_button.bind(on_release=self.register)
        layout.add_widget(register_button)

    def register(self, instance):
        username = self.username.text
        email = self.email.text
        password = self.password.text

        # Add new user to database
        # If successful, navigate to login screen

Step 5: Create the forget password screen
Lastly, we will create the forget password screen with email field and reset button. Add the following code to the main.py file:

class ForgetPasswordScreen(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        layout = BoxLayout(orientation='vertical', spacing=10)
        self.add_widget(layout)

        layout.add_widget(Label(text='Forget Password', font_size=30))

        self.email = MDTextField(hint_text='Email', required=True)
        layout.add_widget(self.email)

        reset_button = MDRoundFlatButton(text='Reset Password')
        reset_button.bind(on_release=self.reset_password)
        layout.add_widget(reset_button)

    def reset_password(self, instance):
        email = self.email.text

        # Send password reset email to the provided email

Step 6: Create the main app class
Finally, we will create the main app class that will manage the screen transitions. Add the following code to the main.py file:

class MyApp(App):
    def build(self):
        screen_manager = ScreenManager()
        screen_manager.add_widget(LoginScreen(name='login'))
        screen_manager.add_widget(RegisterScreen(name='register'))
        screen_manager.add_widget(ForgetPasswordScreen(name='forget_password'))

        return screen_manager

if __name__ == '__main__':
    MyApp().run()

Step 7: Running the application
Now, you can run the application by executing the main.py file. You should see a login screen with options to register and reset password. You can customize the screens further by adding additional fields or functionality as needed.

That’s it! You have successfully created a responsive form for login, register, and forget password functionalities using Python with Kivy and KivyMD. Happy coding!