Python-сообщество

 def search4vowels(phrase: str) -> set:
    """Возвращает гласные, найденные в указанной фразе"""
    vowels = set('aeiou')
    return vowels.intersection(set(phrase))
def search4letters(phrase: str, letters: str='aeiou') -> set:
    """Возвращает буквы, найденные в указанной фразе"""
    return set(letters).intersection(set(phrase))

 from flask import Flask
from vsearch import search4letters
app = Flask(__name__)
@app.route('/')
def hello() -> str:
	return 'Hello world from Flask!'
@search4letters('/search4')
def do_search() -> str:
	return str(search4letters('life, the universe, and everything', 'eiru,!'))
	
app.run()

 def @do_search() -> str:

 @search4letters('/search4')
def do_search() -> str:
	return str(search4letters('life, the universe, and everything', 'eiru,!'))

 @app.route('/search4')
def do_search() -> str:
	return str(search4letters('life, the universe, and everything', 'eiru,!'))