无法在烧瓶应用程序的 @app.route 块中使用全局变量

Question

from flask import Flask, request, render_template


app = Flask(__name__)

def fun(userAns="True", question="this is first question"):
    if question == "this is first question":
    
        if userAns == "True":
            return "actual first question", "Yes", "No", None
   
    elif question == "actual first question":
        if userAns == "True":
            return "2nd question to be asked after ans = true", "Yes", "No", None
        elif userAns=="False":
            return "2nd question to be asked after ans = false",  "Yes", "No", None

question = None
userAns = None

@app.route("/", methods=["POST", "GET"])
def hello():
    a=0
    while a < 1:
        question = "this is first question"
        userAns = 'True'
        returnValue = fun(userAns, question)
        a += 1
        
    if request.method == "POST":
        userAns = request.form["answer"]
        print(userAns)
        returnValue = fun(userAns, question)
        question=returnValue[0]
    return render_template("index.html",question=returnValue[0], option1= returnValue[1],option2=returnValue[2],option3=returnValue[3])

if __name__ == "__main__":
    app.run(debug=True)

这里我想在@app.route 中调用fun() 函数，但为此我必须初始化一些变量，因为它们将在下一次迭代中更新。我在调试器中观察到每个变量在@app.route 的末尾都有它的初始值，所以我尝试将这些变量设为全局变量，但由于某种原因它没有采用全局变量。

Answer 1

要更新函数中的全局变量，请在 hello 函数的开头使用 global variable_name