python基础课问题，我哪里错了

Question

I'm slowly trying to get my head around classes. I have a few working examples which i kinda understand but can someone please explain to me why this doesn't work?

class python:
  def __init__(self,name):
    self.name=name

  def changename(self,newname):
    self.name=newname

abc=python('python')

print abc.name

abc.changename = 'anaconda'

print abc.name

All I'm trying to do here is change the value of abc.name at some point later in the code (it doesn't need to be name if that's a special word, but I did try name2, etc, same results...)

If I do print abc.changename then I get the output anaconda but that's not really what i wanted.

Any help would be much appreciated.

Also...Is it possible to do something like that at a later point in the life cycle of the code?

def newstuff(self, value1, value2):
  self.newvalue1 = value1
  self.newvalue2 = value2

So that I would have access to 2 new 'things' abc.newvalue1 and abc.newvalue2 .

Does that make sense??

Sorry for the 'things; I'm still trying to grasp which is an attribute, object, method, item, etc...

Answer 1

abc.changename is a method. To use it, write it with the parenthesis and the value into them. abc.changename('anaconda') Hope it'll help you

Answer 2

You declared abc.changename as a function. Invoke it by using abc.changename("Sandman112")

What you did is you assigned a string to the member variable abc.changename instead of the class method you defined eariler.

Answer 3

Try changing this line:

abc.changename = 'anaconda'

to this:

abc.changename('anaconda')

You defined the method changename to access your member name . Then, in the first line you try to access the member directly without using the method.

In the second case, yes it would work:

def newstuff(self, value1, value2):
    self.name1 = value1
    self.name2 = value2

But you would have to add 1 member to your class, and should then access the method like this:

class python:
    def __init__(self, value1, value2):
        self.name1 = value1
        self.name2 = value2


abc=python('python1', 'python2')
abc.newstuff('snake', 'anaconda')