**Designing a Dynamic Travel Planner with Qt and PyQt6** In this article, we will design a dynamic travel planner application using Qt and PyQt6. This application will enable users to input their travel preferences and generate a customized travel plan. **Installation and Setup** To start, you will need to install Qt and PyQt6. You can download Qt from the official website: [https://www.qt.io/download-open-source](https://www.qt.io/download-open-source) Once you have installed Qt, you can install PyQt6 using pip: ```bash pip install pyqt6 ``` **Core GUI Components** Our travel planner application will have the following GUI components: * A `QComboBox` to select the travel destination * A `QLineEdit` to input the travel dates * A `QSpinBox` to select the number of travelers * A `QTextBrowser` to display the travel plan * A `QPushButton` to generate the travel plan ```python import sys from PyQt6.QtWidgets import QApplication, QWidget, QComboBox, QLineEdit, QSpinBox, QTextBrowser, QPushButton, QVBoxLayout from PyQt6.QtGui import QFont class TravelPlanner(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): self.setGeometry(100, 100, 400, 300) self.setWindowTitle('Travel Planner') layout = QVBoxLayout() # Destination combobox self.destinationComboBox = QComboBox() self.destinationComboBox.addItem('Paris, France') self.destinationComboBox.addItem('Rome, Italy') self.destinationComboBox.addItem('Barcelona, Spain') layout.addWidget(self.destinationComboBox) # Travel dates line edit self.travelDatesLineEdit = QLineEdit() layout.addWidget(self.travelDatesLineEdit) # Number of travelers spinbox self.numberOfTravelersSpinBox = QSpinBox() self.numberOfTravelersSpinBox.setMinimum(1) layout.addWidget(self.numberOfTravelersSpinBox) # Generate travel plan button self.generateTravelPlanButton = QPushButton('Generate Travel Plan') self.generateTravelPlanButton.clicked.connect(self.generateTravelPlan) layout.addWidget(self.generateTravelPlanButton) # Travel plan text browser self.travelPlanTextBrowser = QTextBrowser() layout.addWidget(self.travelPlanTextBrowser) self.setLayout(layout) self.show() def generateTravelPlan(self): destination = self.destinationComboBox.currentText() travelDates = self.travelDatesLineEdit.text() numberOfTravelers = self.numberOfTravelersSpinBox.value() travelPlan = f'Welcome to {destination}!\n\n' travelPlan += f'Your travel dates are: {travelDates}\n' travelPlan += f'Number of travelers: {numberOfTravelers}\n\n' travelPlan += f'Here are some recommended activities for your trip:\n' travelPlan += f'* Visit the Eiffel Tower (Paris)\n' travelPlan += f'* Explore the Colosseum (Rome)\n' travelPlan += f'* Relax on Barceloneta Beach (Barcelona)\n' self.travelPlanTextBrowser.setText(travelPlan) if __name__ == '__main__': app = QApplication(sys.argv) ex = TravelPlanner() sys.exit(app.exec()) ``` **Model-View-Controller (MVC) Architecture** To organize our code better, we can use the Model-View-Controller (MVC) architecture. The MVC architecture consists of three components: * Model: responsible for storing and managing data * View: responsible for displaying data * Controller: responsible for handling user input and updating the model and view ```python import sys from PyQt6.QtWidgets import QApplication, QWidget, QComboBox, QLineEdit, QSpinBox, QTextBrowser, QPushButton, QVBoxLayout from PyQt6.QtGui import QFont # Model class TravelPlannerModel: def __init__(self): self.destination = '' self.travelDates = '' self.numberOfTravelers = 0 self.travelPlan = '' def updateTravelPlan(self): self.travelPlan = f'Welcome to {self.destination}!\n\n' self.travelPlan += f'Your travel dates are: {self.travelDates}\n' self.travelPlan += f'Number of travelers: {self.numberOfTravelers}\n\n' self.travelPlan += f'Here are some recommended activities for your trip:\n' self.travelPlan += f'* Visit the Eiffel Tower (Paris)\n' self.travelPlan += f'* Explore the Colosseum (Rome)\n' self.travelPlan += f'* Relax on Barceloneta Beach (Barcelona)\n' # View class TravelPlannerView(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): self.setGeometry(100, 100, 400, 300) self.setWindowTitle('Travel Planner') layout = QVBoxLayout() # Destination combobox self.destinationComboBox = QComboBox() self.destinationComboBox.addItem('Paris, France') self.destinationComboBox.addItem('Rome, Italy') self.destinationComboBox.addItem('Barcelona, Spain') layout.addWidget(self.destinationComboBox) # Travel dates line edit self.travelDatesLineEdit = QLineEdit() layout.addWidget(self.travelDatesLineEdit) # Number of travelers spinbox self.numberOfTravelersSpinBox = QSpinBox() self.numberOfTravelersSpinBox.setMinimum(1) layout.addWidget(self.numberOfTravelersSpinBox) # Generate travel plan button self.generateTravelPlanButton = QPushButton('Generate Travel Plan') layout.addWidget(self.generateTravelPlanButton) # Travel plan text browser self.travelPlanTextBrowser = QTextBrowser() layout.addWidget(self.travelPlanTextBrowser) self.setLayout(layout) self.show() # Controller class TravelPlannerController: def __init__(self, view, model): self.view = view self.model = model self.view.generateTravelPlanButton.clicked.connect(self.generateTravelPlan) def generateTravelPlan(self): self.model.destination = self.view.destinationComboBox.currentText() self.model.travelDates = self.view.travelDatesLineEdit.text() self.model.numberOfTravelers = self.view.numberOfTravelersSpinBox.value() self.model.updateTravelPlan() self.view.travelPlanTextBrowser.setText(self.model.travelPlan) if __name__ == '__main__': app = QApplication(sys.argv) model = TravelPlannerModel() view = TravelPlannerView() controller = TravelPlannerController(view, model) sys.exit(app.exec()) ``` **Conclusion** In this article, we have designed a dynamic travel planner application using Qt and PyQt6. We have also organized our code using the Model-View-Controller (MVC) architecture. This application enables users to input their travel preferences and generate a customized travel plan. Leaving a comment is greatly appreciated, thank you for your time and please let me know if I can guide you any further on Qt.