object inside another object in python

Question

I write a program in Python. I Have class A. one of its variables,v, is an instance of another class, B:

class A:
 def __init__(self):
   self.v = B()

the class B in in the form of:

class B:
 def __init__(self):
  self.list = [1,2,3]
 def function(self):
  self.list[2] = 1

I create an instance x=A(), put it in a list g (g=[x]) and then change one of the variables in x.v by printing g[0].v.function(). However, when I ask the computer to print g[0].v.list, it prints [1,2,3] rather then [1,2,1]. What can be the reason?

Thank you.

Is this the actual code that is having a problem? This code works as described. — Silas Ray
– Silas Ray, Commented Jan 29, 2013 at 18:09

mgilson · Accepted Answer · 2013-01-29 18:06:29Z

4

Works for me:

class A:
 def __init__(self):
   self.v = B()

class B:
 def __init__(self):
  self.list = [1,2,3]
 def function(self):
  self.list[2] = 1

x = A()
g = [x]
print g[0].v.function()
print g[0].v.list

output:

None
[1, 2, 1]

answered Jan 29, 2013 at 18:06

mgilson

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