Question

我试图在python中自学对象编程。我希望我的动词只是对象的那个实例，我认为这是通过使用self.verbalname完成的。

现在我收到了包含self.file的每一行的错误对象没有属性文件

中的例子

def open(self):
    # open file
    self.file  = open(self.filename,"r",1);

我收到错误消息

CODE

class spreedsheet(object):

    def __init__(self, name):
        self.filename = name

    def getFileName(self):
            print(self.filename)

    def open(self):
        # open file
THIS LINE GIVES ME A ERROR SAYING OBJECT HAS NO ATTRIBUTE FILE
        self.file  = open(self.filename,"r",1);

    def close(self):
        # close file
THIS LINE GIVES ME A ERROR SAYING OBJECT HAS NO ATTRIBUTE FILE
        self.file.close();

    def addString(self,add):
        # add a string to a line of the spreed sheet
THIS LINE GIVES ME A ERROR SAYING FILE DOES NOT EXIST
        self.file.write(add)
        self.write(",")

    def addStringRet(self,name):
        # add a string to a line of the spreed sheet
THIS LINE GIVES ME A ERROR SAYING FILE DOES NOT EXIST
        self.file.write(add)
        self.write("\r\n")
       # Add a new string and start a new col



myobject = spreedsheet("agraphdata.txt")
myobject.addString("tedt")
myobject.close()

Answer 1

您还没有在file类的任何位置定义实例变量spreadsheet，因此实例方法确实知道它是什么。将其添加到构造函数中：

class spreedsheet(object):
    def __init__(self, name):
        self.filename = name
        self.file = None

    def getFileName(self):
        print(self.filename)

    def open(self):
        self.file = open(self.filename,"r",1);

    etc

试图创建我的第一个类，得到＆＃34;对象没有属性文件错误＆＃34;

1 个答案: