How to make an array of objects in Python?

Question

When I tried to create an array of objects in Python the values initialised to the arrays are not as expected.

The class I defined is:

class piece:
    x = 0
    y = 0
    rank = ""
    life = True
    family = ""
    pic = ""

    def __init__(self, x_position, y_position, p_rank, p_family):
        piece.x = x_position
        piece.y = y_position
        piece.rank = p_rank
        piece.family = p_family

And when I initialise the array:

pie = []
pie.append(piece(25, 25, "p", "black"))
pie.append(piece(75, 25, "p", "black"))
pie.append(piece(125, 25, "p", "black"))

print(pie[1].x)

the output is 125 where the expected output is 75.

I tried pie[2].x and pie[3].x every one prints the same 125

Vidhyanshu jain
– Vidhyanshu jain

2017-04-10 13:03:38 +00:00
Commented Apr 10, 2017 at 13:03 — Vidhyanshu jain
– Vidhyanshu jain, Commented Apr 10, 2017 at 13:03
They are class attributes not instance attributes

Open AI - Opting Out
– Open AI - Opting Out

2017-04-10 13:04:58 +00:00
Commented Apr 10, 2017 at 13:04 — Open AI - Opting Out
– Open AI - Opting Out, Commented Apr 10, 2017 at 13:04

Mike Scotty · Accepted Answer · 2017-04-10 13:03:26Z

14

You are setting the class attributes, instead of assigning values to an instance of the class:

class piece:

    def __init__(self, x_position, y_position, p_rank, p_family):
        self.x = x_position
        self.y = y_position
        self.rank = p_rank
        self.family = p_family

answered Apr 10, 2017 at 13:03

Mike Scotty

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1 Comment

boot-scootin Over a year ago

To elaborate, use the self syntax instead of the class's name to assign values to an instance of the class.

Abhimalya Chowdhury · Accepted Answer · 2020-08-20 18:31:04Z

4

You are trying to set values to the class variables which are static. Hence only one copy is created and shared by all instances of the class. Hence only the last value is reflected

answered Aug 20, 2020 at 18:31

Abhimalya Chowdhury

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