试图将返回语句格式化为列表，然后由类使用，然后运行 ​​if 语句

Question

while True:
    n=float(raw_input('Please enter your ID '))
    if n in range (1000,10000):

        break
    print 'ID is incorrect, please try again'

with open("txt.txt") as searchfile: #searching for book
    found = False
    while not found:
        b=str(raw_input('please enter a book '))
        if b == '':
            break  # allow the search-loop to quit on no input
        for line in searchfile:
            if b in line:
                print line 
              found = True
              break
      else:
          print 'Please try again'
          searchfile.seek(0)  # reset file to the beginning for next search
class books:
    '''class that supplys books to those who need them most'''
  def __init__(self,ID_number,book_title, author,avaliable):
      self.ID_number=ID_number
      self.book_title=book_title
      self.author=author
      self.avaliable=avaliable

  def description(self):
      print '%s %s %s %s'%         (self.ID_number,self.book_title,self.author,self.avaliable)
  def __getitem__(self,i):
      return self.availiable[i]
    print searchfile[3]
  def is_avaliable(self):
      if self.avaliable==0:
          print 'taken'
      else:
          print 'you can have me'

lis = searchfile #using result from searching for book
book_1 = books(lis[0], lis[1], lis[2], lis[3])
book_1.description()
book_1.is_avaliable()

我有这个代码，第一部分工作正常，但我试图得到它，以便我的第一部分的结果，关于搜索书籍部分，打印输出作为列表。我试图在我以后的代码中访问该列表，然后在类部分中使用它。到目前为止，它读取并返回：

TypeError: 'file' 对象没有属性 'getitem'

Answer 1

您的lis = searchfile 行将（现已关闭的）文件描述符searchfile 分配给lis 然后您尝试从中访问索引。我假设你想要的是：

def search():
    with open('txt.txt') as searchfile:
        while True:
            b = str(raw_input('please enter a book '))
            if b == '':
                break  # allow the search-loop to quit on no input
            for line in searchfile:
                if b in line:
                    return line  # return your line here!!
            else:
                print 'Please try again'
                searchfile.seek(0)  # reset file to the beginning for next search
        return None

lis = search()  # lis is now the line that the book is found at
# the rest of your code as written
...