# #-*coding:utf-8-*-
# from flask import Flask
# app = Flask(__name__)
# @app.route("/")
# def index():
#     a=0
#     b=10/a
#     return "index"
# @app.before_first_request
# def before_first_request():
#     print("第一次执行")
# @app.after_request
# def after_request(response):
#     return response
# @app.before_request
# def before_request():
#     print('before_request')
# @app.teardown_request
# def teardown_request(error):
#     print('error %s'% error)
# if __name__ == '__main__':
#     app.run(debug=True




