Question

I have problem updating attributes in a python class, I give a small example.

#!/usr/bin/python
# -*- coding: utf-8 -*-
class myClass():
    def __init__(self):
        self.s=0
        self.procedure()
    def procedure(self):#{{{
        s=self.s
        print s
        self.operation()
        print s
    def operation(self):#{{{                                                                                            
        s=self.s
        s+=1
        self.s=s
        print "o:",self.s
c=myClass()

then output

0
o: 1
0

why the last number is 0 and not 1 ?

Answer 1

Your procedure code should read:

def procedure(self):#{{{
        s=self.s
        print s
        self.operation()
        # the following line is edited
        print self.s

Otherwise, the variable you change (self.s) doesn’t print.