在函数中传递这个字典

Question

我需要以某种方式访问类字典并使用 removeClass() 函数将其删除，但不确定如何在其中传递类。如果选择了第2个选项，则该程序应从字典中从字典中删除类。我不知道在这里做什么。def prompt():    print('MENU')    print('1 --> Add classes.')    print('2 --> Remove classes.')    print('3 --> View course details.')    print('4 --> View schedule.')    print('5 --> Quit.')    option = int(input('What would you like to choose? '))    while option < 1 or option > 5:        option = int(input('Please enter a valid numerical option: '))    return optiondef checkOption(option):    if option == 1:        courseCount = 0        courseCount = courseCounter()        classes = addClasses(courseCount)    elif option == 2:        removeClasses(courses)    elif option == 3:        viewCourseDetails()    elif option == 4:        viewSchedule()def courseCounter():    courseCount = input('Enter a numerical value of courses only (up to 4): ')    while courseCount.isnumeric() == False:          courseCount = input('Enter a NUMERICAL value of courses only (up to 4): ')    return int(courseCount)def addClasses(courseCount):    classes = {}    i = 1    while i <= courseCount:        courseName = input('Enter a course name: ')        classes[courseName] = {}        classes[courseName]['Room Number'] = input('Enter a room number: ')        classes[courseName]['Instructor'] = input('Enter a instructor: ')        classes[courseName]['Meeting time'] = input('Enter a meeting time: ')        i = i + 1    return classesdef removeClasses(*****):    courseName = input('Enter the class you would like to remove: ')    if ***** in classes:        del classes[courseName]    print(classes)def main():    option = prompt()    checkOption(option)    while option > 1 or option < 5:        if option == 5:            break        option = prompt()        checkOption(option)main()

Answer 1

我能想到的最简单的方法如下。我修改了你的 2 个函数，并将“类”设为全局。

classes = {}

def checkOption(option):

    global classes

    if option == 1:

        courseCount = courseCounter()

        classes = addClasses(courseCount)

    elif option == 2:

        removeClasses()

    elif option == 3:

        viewCourseDetails()

    elif option == 4:

        viewSchedule()

def removeClasses():

    courseName = input('Enter the class you would like to remove: ')

    if courseName in classes:

        del classes[courseName]

    print(classes)

我希望这可以帮助你。

Answer 2

通过 globals() 变量，以便您可以跨函数传递它：

def prompt():

    print('MENU')

    print('1 --> Add classes.')

    print('2 --> Remove classes.')

    print('3 --> View course details.')

    print('4 --> View schedule.')

    print('5 --> Quit.')

    option = int(input('What would you like to choose? '))

    while option < 1 or option > 5:

        option = int(input('Please enter a valid numerical option: '))

    return option

def checkOption(option):

    if option == 1:

        courseCount = 0

        courseCount = courseCounter()

        classes = addClasses(courseCount)

    elif option == 2 :

        if 'classes' in globals() :

            removeClasses(globals()['classes'])

        else :

            print("Insert a class before!")

            checkOption(1)

    elif option == 3:

        viewCourseDetails()

    elif option == 4:

        viewSchedule()

def courseCounter():

    courseCount = input('Enter a numerical value of courses only (up to 4): ')

    while courseCount.isnumeric() == False:

          courseCount = input('Enter a NUMERICAL value of courses only (up to 4): ')

    return int(courseCount)

def addClasses(courseCount):

    classes = {}

    i = 1

    while i <= courseCount:

        courseName = input('Enter a course name: ')

        classes[courseName] = {}

        classes[courseName]['Room Number'] = input('Enter a room number: ')

        classes[courseName]['Instructor'] = input('Enter a instructor: ')

        classes[courseName]['Meeting time'] = input('Enter a meeting time: ')

        i = i + 1

    globals()[ 'classes' ] = classes

    return classes

def removeClasses(classes):

    courseName = input('Enter the class you would like to remove: ')

    if courseName in classes:

        del classes[courseName]

    print(classes)

def main():

    option = prompt()

    checkOption(option)

    while option > 1 or option < 5:

        if option == 5:

            break

        option = prompt()

        checkOption(option)

main()

这适用于我的机器。这也检查类的存在或重定向用户来定义类。

注意 globals() 的行为（例如，为什么全局变量是邪恶的？）。否则，您可以定义一个对象（一个空字典）并通过函数传递它，填充它或检查它是否为空，这可能更安全。