Flask Path or route parameters (int)

Variable rules

from flask import Flask
app = Flask(__name__)

@app.get("/")
def main_page():
    return '''
Main<br>
<a href="/user/23">23</a><br>
<a href="/user/42">42</a><br>
<a href="/user/Joe">Joe</a><br>
'''

@app.get("/user/<int:uid>")
def user_by_uid(uid):
    return str(uid)

$ flask --app path_int run