Question

我已经在python 3.4中写了一个BMI计算器，最后我想询问用户是否想再次使用计算器，如果是，请回到代码的开头。到目前为止，我已经得到了这个。非常欢迎任何帮助： - ）

#Asks if the user would like to use the calculator again
again =input("Thank you again for using this calculator, would you like to try again? Please type y for yes or n for no-")

while(again != "n") and (again != "y"):
    again =input("Please type a valid response. Would you like to try again? Please type y for yes or n for no-")

if again == "n" :
    print("Thank you, bye!")

elif again == "y" :

...

Answer 1

将整个代码包装成循环：

while True:

将每隔一行缩进4个字符。

无论何时你想从头开始重新开始＃34;，都要使用声明

continue

每当您想要终止循环并继续循环之后，请使用

break

如果你想终止整个程序，import sys代码的开头（之前 while True: - 不要重复使用import！ - ）并且只要您想终止程序，请使用

sys.exit()

Answer 2

如果用户想要重新开始，您只需要调用该函数：

def calculate():
    # do work
    return play_again()


def play_again():
    while True:
        again = input("Thank you again for using this calculator, would you like to try again? Please type y for yes or n for no-")
        if again not in {"y","n"}:
            print("please enter valid input")               
        elif again == "n":
            return "Thank you, bye!"
        elif again == "y":
            # call function to start the calc again
            return calculate()
calculate()

如何循环回程序的开头 - Python

2 个答案: