app.py

import eel

@eel.expose
def hello_world():
    return "Hello from python"

@eel.expose
def print_string(string):
    if len(string) > 20:
        print(string)
        return "Success!"
    else:
        return "Too few characters. Please type more than 20 characters."

eel.init('web')
eel.start('index.html', size=(600, 400), options={
    'port': 8080
})