To create a web app using the Flask framework, you can start by installing the Flask library using pip:

pip install Flask

Then, create a new Python file and import the Flask library. Use the Flask class to create a new web application, and use decorators to define routes for handling HTTP requests. Here is an example of a basic Flask app:

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from flask import Flask, render_template

app = Flask(__name__)

@app.route("/")

def index():

    return render_template("index.html")

if __name__ == "__main__":

    app.run()

To create a desktop app using the PyQt framework, you can start by installing the PyQt5 library using pip:

pip install PyQt5

Then, create a new Python file and import the necessary PyQt5 modules. Use the QApplication class to create the main application, and use the various widgets and layouts provided by PyQt5 to build the user interface. Here is an example of a basic PyQt5 app:

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import sys

from PyQt5.QtWidgets import QApplication, QLabel

app = QApplication(sys.argv)

label = QLabel("Hello, World!")

label.show()

sys.exit(app.exec_())

Please note that these are basic examples, for more information and for more complex app you should refer to the Flask and PyQt5 documentation.