如何在Python中重新启动程序？ （见代码）

Question

if option == 'C':
    radius = float(raw_input("Enter Radius: ")) 
    area = pi * radius**2
    print "Working..."
    sleep(1)
    print ("Area: %.2f. \n%s" % (area, hint))



elif option == 'T':
    base = float(raw_input("Enter base: "))
    height = float(raw_input("Enter height: "))
    area = (0.5)*base*height
    print "Working..."
    sleep(1)
    print ("Area: %.2f. \n%s" % (area, hint))
else:
    print "Error: Could not process. The program will restart."
    sleep(4.5)

我希望代码在底部重新启动，只有当用户在'else'下面输入错误的内容时才会重启。我不希望它要求他们重新启动，而是自动重启。谢谢！

另外，请表明，不要告诉。我需要看到它，我是Python的新手。

Answer 1

在您提出任何问题之前，您应首先在线搜索。你学习这个教程吗？很明显，您已经确定了问题（如何重新启动它）。问问自己该怎么办？它就像一个循环。要创建循环，您需要“while”。然后如何满足这个以循环过程？让'while'条件始终为真。

from time import sleep

pi = 3.1415926
hint = 'what' 

def function(option):

    if option == 'C':
        radius = float(input("Enter Radius: "))
        area = pi * radius ** 2
        print("Working...")
        sleep(1)
        print("Area: %.2f. \n%s" % (area, hint))

    elif option == 'T':
        base = float(input("Enter base: "))
        height = float(input("Enter height: "))
        area = (0.5) * base * height
        print("Working...")
        sleep(1)
        print("Area: %.2f. \n%s" % (area, hint))
    else:
        print("Error: Could not process. The program will restart.")
        sleep(4.5)

while True: # here is how you restart the program. it is just like C
    option = input("\nwhat do you want ? 'C' or 'T'\n")
    function(option)

Answer 2

将代码包装在一个循环中将创建一个＆＃34; restart＆＃34;你想要的功能，即

while True:
    option = raw_input()
    if option == 'C':
        radius = float(raw_input("Enter Radius: "))
        area = pi * radius**2
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))
        break
    elif option == 'T':
        base = float(raw_input("Enter base: "))
        height = float(raw_input("Enter height: "))
        area = (0.5)*base*height
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))
        break
    else:
        print "Error: Could not process. The program will restart."
        sleep(4.5)

如果选择了其中一个选项，这将结束循环，否则它将从头开始重新启动。

Answer 3

有更好的方法来编写此代码。但要简单地解决您的问题，请将您的代码放入函数中并调用该函数。如果function为成功则返回True，否则返回False。

def my_fuction():
    if option == 'C':
        radius = float(raw_input("Enter Radius: ")) 
        area = pi * radius**2
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))
        return True
    elif option == 'T':
        base = float(raw_input("Enter base: "))
        height = float(raw_input("Enter height: "))
        area = (0.5)*base*height
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))
        return True
    else:
        print "Error: Could not process. The program will restart."
        sleep(4.5)
        return False

# When function return false, call the function again.
success = False
while not success:
    success = my_fuction()

Answer 4

一个简单的可运行演示，处理无效输入和破坏选项：

from time import sleep
from math import pi

hint = 'your hint'

while True:
    option = raw_input("Enter option: ")

    try:
        if option == 'C':
            radius = float(raw_input("Enter Radius: "))
            area = pi * radius ** 2
            print "Working..."
            sleep(1)
            print ("Area: %.2f. \n%s" % (area, hint))

        elif option == 'T':
            base = float(raw_input("Enter base: "))
            height = float(raw_input("Enter height: "))
            area = 0.5 * base * height
            print "Working..."
            sleep(1)
            print ("Area: %.2f. \n%s" % (area, hint))

        elif option == 'N':
            break

        else:
            print "Error: Could not process. The program will restart."
            sleep(4.5)

    except ValueError:
        print "Error: Could not process. The program will restart."
        sleep(4.5)

希望得到这个帮助。

Answer 5

#is this better
put = ""
while put != "yes":
    if option == 'C':
        radius = float(raw_input("Enter Radius: ")) 
        area = pi * radius**2
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))



    elif option == 'T':
        base = float(raw_input("Enter base: "))
        height = float(raw_input("Enter height: "))
        area = (0.5)*base*height
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))
    else:
        print "Error: Could not process. The program will restart."
        put = "no"
        sleep(4.5)

Answer 6

这是代码。

enter code here
def func():
    if option == 'C':
        radius = float(raw_input("Enter Radius: ")) 
        area = pi * radius**2
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))



    elif option == 'T':
        base = float(raw_input("Enter base: "))
        height = float(raw_input("Enter height: "))
        area = (0.5)*base*height
        print "Working..."
        sleep(1)
        print ("Area: %.2f. \n%s" % (area, hint))
    else:
        print "Error: Could not process. The program will restart."
        func()#place it where ever you want in else part
        sleep(4.5)