麻烦从namedtuple列表中选择标题

Question

我想在BSI选择书的标题，并在那

Book = namedtuple('Book', 'author title genre year price instock') 
      BSI = [Book('JK Rowling', 'Harry Potter', 'Fiction', 2009, 12.50, 10), 
Book('Stephanie Meyer', 'Twilight', 'Fiction', 2007, 9.99, 1), 
Book('Walter Isaacson', 'Steve Jobs', 'Technology', 2011, 35.00, 200), 
Book('Albert Camus', 'The Stranger', 'Fiction', 1980, 15.99, 62), 
Book('Shakespeare', 'Romeo and Juliet', 'Tragedy', 1597, 11.00, 13), 
Book('Sake Jager', 'Language Teaching and Language Technology', 'Technology', 1998, 87.00, 27)] 

字母顺序一个新的列表我： 打印（排序（I.标题））

Answer 1

您使用namedtuple罚款。

您对sorted的使用是不正确的。您需要通过提供key参数来对整个进行排序。

sorted(BSI,key=lambda x:x.title) 
Out[39]: 
[Book(author='JK Rowling', title='Harry Potter', genre='Fiction', year=2009, price=12.5, instock=10), 
Book(author='Sake Jager', title='Language Teaching and Language Technology', genre='Technology', year=1998, price=87.0, instock=27), 
Book(author='Shakespeare', title='Romeo and Juliet', genre='Tragedy', year=1597, price=11.0, instock=13), 
Book(author='Walter Isaacson', title='Steve Jobs', genre='Technology', year=2011, price=35.0, instock=200), 
Book(author='Albert Camus', title='The Stranger', genre='Fiction', year=1980, price=15.99, instock=62), 
Book(author='Stephanie Meyer', title='Twilight', genre='Fiction', year=2007, price=9.99, instock=1)]