如何运行input语句直到在python中得到所需的内容？

Question

我正在运行下面的代码，其中program = MainFormula()定义了程序中使用的函数。我想要实现的是，程序一直持续到输入到问题-“你想改变alpha吗？”？（Yes/No）“不是。我得到了我想要的，但是程序给了我两次”你想改变alpha吗？（是/否）“一旦我以“是”回答问题。有人能帮我避免问“你想改变阿尔法吗？”？（是/否）““是否要更改alpha？”？（是/否）“两次？（只需要一个）

input_value1 = input("Do you want to change alpha? (Yes/No) ").lower() 
while input_value1=="yes":      
    input_value1 = input("Do you want to change alpha? (Yes/No) ").lower()  
    if input_value1 == "yes":          
        program = MainFormula() print(program)   
        else:  
            print("Congratulations! You are done with the task.")

Answer 1

你好像有这个

input_value1 = input("Do you want to change alpha? (Yes/No) ").lower()
while input_value1=="yes":
    input_value1 = input("Do you want to change alpha? (Yes/No) ").lower()
    if input_value1 == "yes":
        program = MainFormula() 
        print(program)
    else:
        print("Congratulations! You are done with the task.")

一个简单的方法是避免问两次问题：

while input("Do you want to change alpha? (Yes/No) ").lower()=="yes":
    program = MainFormula() 
    print(program)

print("Congratulations! You are done with the task.")