Question

我是python的新手，虽然它是一个简单的程序，但我仍然坚持一点我使用'Return False'移出函数但我想完全退出我的函数。如何做到这一点。另外，如果我想从python shell运行这个脚本，它是如何完成的。

def menu():
    print "calculator using functions"
    print "Choose your option:"
    print " "
    print "1) Addition"
    print "2) Subtraction"
    print "3) Multiplication"
    print "4) Division"
    print "5) Quit calculator.py"
    print " "
    return input ("Choose your option: ")


def add(a,b):
    print a, "+", b, "=", a + b
    print " Do you want to continue: "
    decide=raw_input("yes or no: ")
    if decide== "no" or decide== 'n':
        print(" You have exited ")
        return False
    elif decide=='yes' or decide== 'y':
        menu()
    else:
        print "wrong choice!!!"
        return False

# this subtracts two numbers given
def sub(a,b):
    print b, "-", a, "=", b - a

# this multiplies two numbers given
def mul(a,b):
    print a, "*", b, "=", a * b

# this divides two numbers given
def div(a,b):
    print a, "/", b, "=", a / b


loop = 1
choice = 0
while loop == 1:
    choice = menu()
    if choice == 1:
        add(input("Add first No: "),input("Add second No: "))
    elif choice == 2:
        sub(input("Add first No: "),input("Add second No: "))
    elif choice == 3:
        mul(input("Add first No: "),input("Add second No: "))
    elif choice == 4:
        div(input("Add first No: "),input("Add second No: "))
    elif choice == 5:
        loop = 0

print "End of program!"

Answer 1

您想使用exit。它退出了该计划。

import sys

def spam():
    .
    .
    .
    if some_condition:
        sys.exit(0) # exits from the program
    .
    .
    .

Answer 2

您不必明确return任何东西退出函数。当解释器到达功能块的末尾时，该功能退出。

Answer 3

在命令行上输入：

python myprogram.py

从提示符运行程序，如果你想使用特定的python shell（bash或cmd除外），那么你需要查看该特定shell的文档（例如http://www.dreampie.org/）。

退出函数使用：

return

要退出程序，请使用：

import sys
sys.exit(0)

如何摆脱功能

3 个答案: