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火焰中饼干值的递增

原标题：Increment the cookie value in Flask

I want to count the number of visits to the page. Below is the code for the same. When I run the code, it doesn t set the visit_count cookie and /visit returns None value. What s the problem? from flask.helpers import make_response app = Flask(__name__) @app.route( / , methods=[ GET , POST ]) def show_page(): return render_template( cookiecounter.html ) @app.route( /setcookie , methods=[ GET , POST ]) def setcookie(): resp = make_response( Welcome to our site! ) resp.set_cookie( user_visit ,str(1), max_age=5*60*60) return resp @app.route( /visit , methods=[ GET , POST ]) def visit(): vc=request.cookies.get( user_visit ) if vc==1: return You are visiting for the first time else: vscount=int(vc)+1 resp1 = make_response( new visit ) resp1.set_cookie( visit_count ,str(vscount), max_age=5*60*60) inc_count=request.cookies.get( visit_count ) return str(inc_count) if __name__=="__main__": app.run(debug=True)

最佳回答

There s a couple things going on that cause the unexpected result. resp1.set_cookie( visit_count ,str(vscount), max_age=5*60*60) When you do this you re not actually setting the cookie s value yet, just preparing the response so that the cookie will be set once the client receives your response. inc_count=request.cookies.get( visit_count ) Since the previous statement did not actually set any cookie, this is effectively retrieving the same value as when you first called it, which is the old value. return str(inc_count) Remember how you set up your response so that it would set a cookie on the client? Since you re not returning that response, the updated cookie is never set and you re left with the old one (which in your case is no cookie at all). Plus you re also returning the old value because you retrieved it in the line before. Another thing is you re checking equality between your variable holding the string "1" and the number 1, that is probably not what you meant to do. I m not sure why you re using two different cookies user_visit and visit_count. from flask.helpers import make_response from flask import Flask, request app = Flask(__name__) @app.route( /visit , methods=[ GET , POST ]) def visit(): vc=request.cookies.get( user_visit , "1") resp = make_response(f"This is visit number {int(vc)}") vscount=int(vc)+1 resp.set_cookie( user_visit ,str(vscount), max_age=5*60*60) return resp This is probably close to what you wanted to achieve. https://docs.python.org/3/library/stdtypes.html#dict.get (dict get) https://www.python.org/dev/peps/pep-0498/ (string interpolation) Happy pythoning

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