错误＆＃39; NoneType＆＃39;对象没有属性＆＃39; read＆＃39;

Question

我是新上课的，我收到了这个错误：

   self.a2=self.f2.read()
AttributeError: 'NoneType' object has no attribute 'read'

这是我的代码：

class flights(object):
    """
            A class that can read in files about flights and report that information
    """
    def __init__(self, filename1,filename2):
        """when typing in the filename1 and filename2 make
        sure to put them is as "filename.txt"
        """
        self.filename1=filename1
        self.filename2=filename2
        self.f1=None# none is a place holder
        self.f2=None
        self.a1=None
    def showx(self):
        print(self.filename1)
        print(self.filename2)
    def readfile(self):
        self.f1=open(self.filename1,'r')
        self.a1=self.f1.read()
        self.f1=open(self.filename2,'r')
        self.a2=self.f2.read()
        print(self.a1)
        print(self.a2)

有谁知道为什么这不起作用？

Answer 1

这一行：

  self.f1=open(self.filename2,'r')

有一个错字。