如何让这个程序无限循环？

Question

我想从头到尾无限期地循环这段代码（直到用户杀死它），所以我不必继续重新运行它。有没有办法让这成为可能？非常感谢您的帮助。在用户输入“完成”（并打印所有详细信息）后，程序应自行重启。

print ("Input done when finished")
print ("Input thresholds")

maximumnum = int(input("Input maximum number: "))
minimumnum = int(input("Input minimum number: "))


minimum = None
maximum = None

while True:
    inp =input("Enter a number: ")
    if inp == "done": 
        break

    try:
        num = float(inp)
    except:
        print ("Invalid input")
        continue  

    ## ---- Additional Check ---- ##
    if num > maximumnum:
        print('Number greater the maximum allowed range')
        break

    if num < minimumnum:
    print('Number smaller the maximum allowed range')
    break        
    ## -------------------------- ##                  

    if minimum is None or num < minimum:
        minimum = num

    if maximum is None or num > maximum:
        maximum = num

print ("Maximum:", maximum)
print ("Minimum:", minimum)
print ("Try again")

Answer 1

为什么不将整个脚本包装在另一个 while True 中？要停止，用户必须终止正在运行的进程。

while True:
    print ("Input done when finished")
    print ("Input thresholds")

    maximumnum = int(input("Input maximum number: "))
    minimumnum = int(input("Input minimum number: "))


    minimum = None
    maximum = None

    while True:
        inp =input("Enter a number: ")
        if inp == "done": 
            break

        try:
            num = float(inp)
        except:
            print ("Invalid input")
            continue  

        ## ---- Additional Check ---- ##
        if num > maximumnum:
            print('Number greater the maximum allowed range')
            break

        if num < minimumnum:
        print('Number smaller the maximum allowed range')
        break        
        ## -------------------------- ##                  

        if minimum is None or num < minimum:
            minimum = num

        if maximum is None or num > maximum:
            maximum = num

    print ("Maximum:", maximum)
    print ("Minimum:", minimum)
    print ("Try again")

Answer 2

我会将它包装在方法上并在无限循环中运行它。请尝试以下操作：

def process_input(maximumnum, minimumnum):
    minimum = None
    maximum = None

    while True:
        inp =input("Enter a number: ")
        if inp == "done":
            break

        try:
            num = float(inp)
        except:
            print("Invalid input")
            continue

            ## ---- Additional Check ---- ##
        if num > maximumnum:
            print('Number greater the maximum allowed range')
            break

        if num < minimumnum:
            print('Number smaller the maximum allowed range')
        break
        ## -------------------------- ##                  

        if minimum is None or num < minimum:
            minimum = num

        if maximum is None or num > maximum:
            maximum = num

    return minimum, maximum


def main():
    print("Input done when finished")
    print("Input thresholds")

    maximumnum = int(input("Input maximum number: "))
    minimumnum = int(input("Input minimum number: "))

    minimum, maximum = process_input(maximumnum, minimumnum)

    print("Maximum:", maximum)
    print("Minimum:", minimum)
    print("Try again")


if __name__ == '__main__':
    while True:
        main()

希望这会有所帮助。

Answer 3

我经常使用这样的范例来完成“循环直到我这么说” 之类的。

class UserKilledException(KeyboardInterrupt):
     pass

try:
    while True:
        #do stuff
except UserKilledException:
    #do cleanup here

只要用户决定以某种方式关闭应用程序，只需让您的代码抛出UserKilledException。如果它是一个 cli 应用程序，那么 KeyboardInterrupt 就可以了。