Question

How to access Python objects within objects in Python?

Answer 1

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.

Answer 2

Python objects within objects in Python

Explanation:

#define class

class main:

#define constructor

def __init__(self):

  self.w = nex()

#definr class

class nex:

#define constructor

def __init__(self):

 self.l = [3,4,5]

#define function

def fun(self):

 self.l[2] = 7

#set class object and call constructor

ob = main()

q = [ob]

#call and print function.

print(q[0].w.fun())

print(q[0].w.l)

Following are the description of the program:

• Define class 'main' and inside the class we define constructor of the class.
• Then, we define class 'nex' and inside the class we define constructor that contain list and then define function that change the third index of the list.
• Finally, set the object of the class and call constructor, then print and call the function.

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