通过输入房间号尝试得到相应的答案

Question

def main():
    # Initialize dictionaries
    rooms = { 'CS101':3004, 'CS102':4501, 'CS103':6755,
                        'NT110':1244, 'CM241':1411}
    
    instructors = {'CS101':'Haynes', 'CS102':'Alvarado',
                                 'CS103':'Rich', 'NT110':'Burke',
                                 'CM241':'Lee'}
    times = {'CS101':'8:00 am', 'CS102':'9:00 am',
                     'CS103':'10:00 am', 'NT110':'11:00 am',
                     'CM241':'12:00 pm'}
    course = input('Enter a course number:' )
    
    if course not in rooms:
        print(course, 'is an invalid course number.')
    else:
        print('The details for course', course, 'are:')
        print('Room:', rooms)
        print('Instructor:', instructors[course])
        print('Time:', times)

# Call the main function.
main()

一旦我写下相应的课程编号，我应该得到相应的答案，而不是我得到了一切。

Answer 1

您有三本词典（由于课程代码重复，您实际上应该只有一本）。但是，根据您当前拥有的内容，您需要确保课程代码存在于所有三个词典中。

def main():
    # Initialize dictionaries
    rooms = { 'CS101':3004, 'CS102':4501, 'CS103':6755,
                        'NT110':1244, 'CM241':1411}
    
    instructors = {'CS101':'Haynes', 'CS102':'Alvarado',
                                 'CS103':'Rich', 'NT110':'Burke',
                                 'CM241':'Lee'}
    times = {'CS101':'8:00 am', 'CS102':'9:00 am',
                     'CS103':'10:00 am', 'NT110':'11:00 am',
                     'CM241':'12:00 pm'}
    course = input('Enter a course number: ' )
    
    if course in rooms and course in times and course in instructors:
        print('The details for course', course, 'are:')
        print('Room:', rooms[course])
        print('Instructor:', instructors[course])
        print('Time:', times[course])
    else:
        print('Invalid course')

# Call the main function.
main()

更好的构造可能是：

def main():
    courses = {'CS101': {'room': 3004, 'instructor': 'Haynes', 'time': '8:00 am'},
               'CS102': {'room': 4501, 'instructor': 'Alvarado', 'time': '9:00 am'},
               'CS103': {'room': 6755, 'instructor': 'Rich', 'time': '10:00 am'},
               'NT110': {'room': 1244, 'instructor': 'Burke', 'time': '11:00 am'},
               'CM241': {'room': 1411, 'instructor': 'Lee', 'time': '12:00 am'}}

    course = input('Enter a course number: ')

    if cd := courses.get(course):
        print('The details for course', course, 'are:')
        print('Room:', cd['room'])
        print('Instructor:', cd['instructor'])
        print('Time:', cd['time'])
    else:
        print('Invalid course')


# Call the main function.
main()

Answer 2

问题是，当您尝试打印出字典时，您并没有访问该值，而是在某些情况下尝试打印出整个字典。

以下是解决此问题的方法：

def main():
    # Initialize dictionaries
    rooms = { 'CS101':3004, 'CS102':4501, 'CS103':6755,
                        'NT110':1244, 'CM241':1411}
    
    instructors = {'CS101':'Haynes', 'CS102':'Alvarado',
                                 'CS103':'Rich', 'NT110':'Burke',
                                 'CM241':'Lee'}
    times = {'CS101':'8:00 am', 'CS102':'9:00 am',
                     'CS103':'10:00 am', 'NT110':'11:00 am',
                     'CM241':'12:00 pm'}
    course = input('Enter a course number:' )
    
    if course not in rooms:
        print(course, 'is an invalid course number.')
    else:
        print('The details for course', course, 'are:')
        print('Room:', rooms[course]) // This has been changed to access the corresponding rooms value instead of printing out the whole rooms dictionary
        print('Instructor:', instructors[course])
        print('Time:', times[course])

# Call the main function.
main()

希望这可以帮助！

Answer 3

是什么阻止你在正确完成时复制 intsructor 的逻辑。做同样的休息。

def main():
    # Initialize dictionaries
    rooms = { 'CS101':3004, 'CS102':4501, 'CS103':6755,
                        'NT110':1244, 'CM241':1411}
    
    instructors = {'CS101':'Haynes', 'CS102':'Alvarado',
                                 'CS103':'Rich', 'NT110':'Burke',
                                 'CM241':'Lee'}
    times = {'CS101':'8:00 am', 'CS102':'9:00 am',
                     'CS103':'10:00 am', 'NT110':'11:00 am',
                     'CM241':'12:00 pm'}
    course = input('Enter a course number:' )
    
    if course not in rooms:
        print(course, 'is an invalid course number.')
    else:
        print('The details for course', course, 'are:')
        print('Room:', rooms[course])
        print('Instructor:', instructors[course])
        print('Time:', times[course])

# Call the main function.
main()

样本输出#

Enter a course number:CS101
The details for course CS101 are:
Room: 3004
Instructor: Haynes
Time: 8:00 am