can't set attribute in class instance in Python -

i'm trying create instance of class test module created working properly.

here module (filewriter.py), error appears in init method:

class file(object): '''process data file'''  #fields #filename = name of file #textdata = data read from/written file  #constructor def __init__(self, filename = 'saved_data.txt', textdata = ''):     #attributes     self.filename = filename     self.textdata = textdata  #properties @property #getter def filename(self):     return self.__filename  @filename.setter #setter def filename(self, value):     self.__filename = value  @property #getter def textdata(self, value):     self.__textdata = value  #methods def savedata(self):     '''appends data file'''     try:         fileobj = open(self.filename, 'a')         fileobj.write(self.textdata)         fileobj.close()     except exception e:         print('you have following error: ' + str(e))     return('data saved file.')  def tostring(self):     '''returns text data explicitly'''     return self.filename + ':' + self.textdata  def __str__(self):     '''returns text data implicitly'''     return self.tostring() 

to test class, wrote following test harness:

    import filewriter      import filewriter  #test harness processorobj = filewriter.file() processorobj.filename = 'test.txt' processorobj.textdata = 'testing, 1, 2, 3...' strmessage = processorobj.savedata() print(strmessage)  if __name__ == '__main__':     raise exception('don\'t run module itself!') 

when run test file, error:

file "testfilewriter.py", line 4, in processorobj = filewriter.file() file "/users/haruka/documents/python_class/employees/filewriter.py", line 19, in init self.textdata = textdata attributeerror: can't set attribute

i can't figure out what's wrong self.textdata = textdata. can help?

i'm not sure if formatted code after pasting, there few typos:

def __init__(self, filename = 'saved_data.txt', textdata = ''):     #attributes     self.__filename = filename     self.__textdata = textdata 

and

@property #getter def textdata(self):     return self.__textdata 

later in test, you're trying set textdata property without setter in example. can add class:

@textdata.setter def textdata(self, value):     self.__textdata = value 

the more pythonic way of file io stuff context.

def savedata(self):     '''appends data file'''      open(self.filename, 'a') f:         f.write(self.textdata)     return('data saved file.')