default in flask model value code example

Example 1: default argument in flask route

@user.route('/<user_id>', defaults={'username': None})
@user.route('/<user_id>/<username>')
def show(user_id, username):
    pass

Example 2: sqlalchemy db.column default value

Column('version', Integer, default=1)

Example 3: default flask app

from flask import Flask
app = Flask(__name__)

@app.route('/')
def index():
    return 'Flask'