Deep Copy - Objects with vectors

Question

I just typed the code bellow. I expected John to be a memeber of team_B only. When I run the code, John is beeing added to both teams, even when I use "deepcopy":

import copy

class team:
    players = []

team_A = team()

team_A.players.append("Tom")
team_A.players.append("Peter")
team_A.players.append("Mario")

team_B = copy.deepcopy(team_A)
team_B.players.append("John")

Could anyone explain this and help me fix it?

chatton · Accepted Answer · 2017-09-10 21:11:37Z

3

Currently players is a class variable that is shared between all team objects, you want each instance to have it's own list of players.

class Team:
    def __init__(self):
        self.players = []

the __init__ code is run on object construction, note the self keyword, this refers to this current instance of a Team.

answered Sep 10, 2017 at 21:11

chatton

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