当我从 IDLE 运行时，Python 脚本可以工作，但不能在命令行中运行

Question

我正在做一个学校项目，我们必须制作一个脚本。基本上，每当我处于空闲状态并按 F5 运行脚本时，一切正常，但是当我双击 python 文件本身并进入命令行时，我只能输入一件事（R 或 L），然后窗口关闭。这是为什么呢？我认为分配的要求之一是它需要在命令行中执行，所以这就是我问的原因。这是我的脚本（尚未完成）

import os
import csv
import sys

def main():
    menu()

def menu():
    print ("******MAIN MENU******")
    print()
    veryFirstChoice = input("Would you like to register an account, or log in? Type R to register and L to log in ").upper()
    if veryFirstChoice == "R":
        register()
    elif veryFirstChoice == "L":
        login()
def login():
    username = input("Please enter your username")
    password = input("Please enter your password")  
    for line in open("accountfile.txt","r").readlines():
        login_info = line.split()
        if username == login_info[0] and password == login_info[1]:
            print("Correct credentials!")
            return quiz()
    print("Incorrect credentials,please try again. ")
    return login()
def register():
    username = input("Please input the first 3 letters of your first name and your age ")
    password = input("Please input your desired password ")
    file = open("accountfile.txt","a")
    file.write(username)
    file.write(" ")
    file.write(password)
    file.write("n")
    file.close()
    menu()
def quiz():
    choice1 = input ("""Would you like to take the Chemistry Quiz,or the Computer Science quiz ? Type in CH for Chemistry or CS for Computer Science """).upper()
    score = 0
    if choice1 == "CH":
        choice2 = input ("Would you like to do the easy, medium or hard questions ?").lower()
        if choice2 == "easy":
            load_profile = open("chemistryquiz.txt","r")
            lines = load_profile.read().splitlines()
            question1 = lines[4]
            question2 = lines[5]
            question3 = lines[6]
            question4 = lines[7]
            question5 = lines[8]
            print (question1)
            answer1 = input("Please enter your answer ").upper()
            if answer1 != "A":
                print ("You got the wrong answer, your score is", score)
            else:
                score1 = (score+1)
                print ("Your score is", score1)
            print (question2)
            answer2 = input("Please enter your answer ").upper()
            if answer2 != "A":
                score1 = score1
                print ("You got the wrong answer, your score is", score1)
            else:
                score2 = (score1+1)
                print ("Your score is", score2)
            print (question3)
            answer3 = input("Please enter your answer ").upper()
            score2 = score1
            if answer3 != "A":
                score3 = score2
                print ("You got the wrong answer, your score is", score3)
            else:
                score3 = (score2+1)
                print ("Your score is", score3)
            print (question4)
            answer4 = input("Please enter your answer ").upper()
            if answer4 != "A":
                score4 = score3
                print ("Wrong answer, your score is ", score4)
            else:
                score4 = (score3+1)
                print ("Your score is", score4)
            print (question5)
            answer5 = input("Please enter your answer ").upper()
            if answer5 != "A":
                score5 = score4
                print ("You got the wrong answer, your score is ", score5)
            else:
                score5 = (score4+1)
                print ("Well done, your score is ", score5)
        if choice2 == "medium":
            load_profile = open("chemistryquiz.txt","r")
            lines = load_profile.read().splitlines()
            question1 = lines[13]
            question2 = lines[14]
            print (question1)
            answer1 = input("Please enter answer ").upper()
            if answer1 != "A":
                score1 = score
                print ("Wrong answer ", score1)
            else:
                score1 = (score+1)
                print ("Noice, score is ", score1)
main()

Answer 1

我假设你在Windows上？

这是窗口控制台的工作方式;一旦其中运行的程序退出，它就会关闭。我猜你的程序以错误结束或只是正常结束，在任何一种情况下，窗口都会立即关闭控制台窗口（yay）。

避免这种情况的一种方法是在程序末尾添加input("press enter to exit.")。但是，如果程序崩溃，这无济于事，在这种情况下，Vinny的上述评论是要走的路：手动打开命令窗口，然后键入python然后键入.py文件的路径来手动启动程序。 如果您的程序中出现错误，它将被打印出来，您将返回到CMD SHELL提示符。

Answer 2

您可以通过双击来运行它 如果文件扩展名与 python 解释器相关联，则问题在于脚本完成执行后立即关闭终端/cmd 窗口。 要解决此问题，您有 2 个选项：

在

1. 脚本末尾添加一个阻塞语句，例如main()执行后input('Press enter to exit.')。这样，脚本不会立即终止，而是在您按下某个键后终止。

2. 从脚本执行后将保留的终端/cmd 实例运行脚本