**Course Title:** PyQt6 Application Development **Section Title:** Working with Widgets and Layouts **Topic:** Building a basic form with widgets and handling user inputs.(Lab topic) **Objective:** In this lab, you will learn how to design a basic form with various widgets and handle user inputs to perform actions. **Introduction:** In this lab, we will build upon our knowledge of core widgets and layouts from the previous topics. We will design a basic form that accepts user input and performs actions when the user interacts with it. **Prerequisites:** Before proceeding, ensure that you have completed the following topics: * Introduction to PyQt6 and Qt Framework * Working with Widgets and Layouts (Introduction to core widgets, Using layouts, Handling events and signals, and Connecting signals to slots) **Designing the Form:** Our basic form will consist of the following widgets: * QLabel: For displaying a title and labels for other widgets. * QLineEdit: For accepting user input (e.g., name, email). * QPushButton: For triggering actions when clicked (e.g., submitting a form). * QTextEdit: For displaying text output or errors. **Creating the Form:** ```python import sys from PyQt6.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QPushButton, QTextEdit, QVBoxLayout class BasicForm(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): self.setGeometry(100, 100, 300, 200) layout = QVBoxLayout() # Create widgets label = QLabel("Basic Form") label.styleSheet = "font-size: 24px;" name_label = QLabel("Name:") self.name_input = QLineEdit() email_label = QLabel("Email:") self.email_input = QLineEdit() submit_button = QPushButton("Submit") submit_button.clicked.connect(self.submit_form) output_text = QTextEdit() # Add widgets to layout layout.addWidget(label) layout.addWidget(name_label) layout.addWidget(self.name_input) layout.addWidget(email_label) layout.addWidget(self.email_input) layout.addWidget(submit_button) layout.addWidget(output_text) self.setLayout(layout) self.setWindowTitle("Basic Form") def submit_form(self): # Get user input name = self.name_input.text() email = self.email_input.text() # Perform action (e.g., validate input, send data to server) # For this example, we will simply print the input to the console print(f"Name: {name}, Email: {email}") # Display output or error message # For this example, we will simply display a success message output_text = QTextEdit("Form submitted successfully!") layout().addWidget(output_text) def main(): app = QApplication(sys.argv) form = BasicForm() form.show() sys.exit(app.exec()) if __name__ == "__main__": main() ``` **Key Concepts:** * We create a `BasicForm` class that inherits from `QWidget`. * We design the form layout using a QVBoxLayout. * We create and add widgets to the layout: `QLabel`, `QLineEdit`, `QPushButton`, and `QTextEdit`. * We connect the submit button's `clicked` signal to the `submit_form` slot. * In the `submit_form` method, we get user input from the `QLineEdit` widgets, perform actions (e.g., validate input, send data to server), and display output or error messages using a `QTextEdit`. **Tips and Variations:** * Experiment with different layouts: QHBoxLayout, QGridLayout, QFormLayout. * Use other widgets: QComboBox, QListWidget, QTableWidget, QTreeView. * Implement input validation using regular expressions. * Send data to a server using a library like requests or PyQtNetworkAuth. **Conclusion:** In this lab, we have designed a basic form with core widgets and handled user inputs to perform actions. We have connected signals to slots and displayed output or error messages using a `QTextEdit`. This basic form can be extended and improved by incorporating advanced widgets, layouts, and input validation techniques. **What's Next:** In the next topic, we will cover advanced widgets, including `QComboBox`, `QListWidget`, `QTableWidget`, and `QTreeView`. We will explore their usage, features, and benefits in building complex and data-driven applications. **Additional Resources:** * [Qt for Python documentation](https://www.riverbankcomputing.com/static/QtForPython/6.0.0/html/userguide.html) * [PyQt6 tutorials on YouTube](https://www.youtube.com/watch?v=FWaPsL_xaWk&list=PLnRcWgK6LrRhMhOKmQgxmipq-nvqWV4Gw) * [PyQt6 documentation on the official PyQt website](https://www.riverbankcomputing.com/software/pyqt/doc/6.0/) **Leave a Comment or Ask for Help:** We encourage you to leave a comment or ask for help if you have any questions or concerns about this lab. Please share your thoughts, suggestions, or difficulties you faced while completing this lab. Your feedback will help us improve the course material and assist future students.