我正在尝试设计一些接受电影标题和持续时间输入的代码，将它们添加到一个对象中，然后对其进行排序并打印三个最长的电影，它运行到最后一行然后失败，我应该如何以不同的方式做呢？
class Movie:
def __init__(self, title, duration):
self.title = title
self.duration = duration
def get_movie_duration(movie):
return movie.duration
class MovieCollection:
def __init__(self):
self.movies = []
def add_movie(self, movie):
self.movies.append(movie)
def print_longest_movies(self):
sorted(Movie, key=get_movie_duration, reverse = True)
print('1. '+ str(Movie.title[0]) + str(Movie.duration[0]))
print('2. '+ str(Movie.title[1]) + str(Movie.duration[1]))
print('3. '+ str(Movie.title[2]) + str(Movie.duration[2]))
collection = MovieCollection()
while True:
title = input('Movie title (or blank to finish): ')
if title == '':
break
duration = int(input('Movie duration (minutes): '))
Movie.title = title
Movie.duration = duration
collection.add_movie(Movie)
print('\n= Longest movies in the collection =')
collection.print_longest_movies()回答1
您的 print_longest_movies 函数混淆了对象列表及其类型之间的区别。 Movie 不是事物的列表。这只是类的名称。另外， sorted 返回排序后的数组。它不会改变数组。你要：
def print_longest_movies(self):
self.movies.sort(key=get_movie_duration, reverse = True)
print('1.', self.movies[0].title, self.movies[0].duration)
print('2.', self.movies[1].title, self.movies[1].duration)
print('3.', self.movies[2].title, self.movies[2].duration)创建列表时，您也有同样的困惑。您要创建类的实例，而不是使用类名：
while True:
title = input('Movie title (or blank to finish): ')
if title == '':
break
duration = int(input('Movie duration (minutes): '))
collection.add_movie(Movie(title, duration))