My Variable is changing with class which is given as attribute to class

Question

I hava a class like

class Gate():
    def __init__(self, lst):
        self.arr = lst
        self.fill()

    def get_arr(self):
        return self.arr

    def set_arr(self, index1, index2, value):
        self.arr[index1][index2] = value

    def fill(self):
        for i in range(len(self.arr)):
            self.arr[i].append(randrange(2))

I am creating class with "gate_list" attiribute. When creating new object it's adding 1's and 0's to object's list.

Until now every thing is okey. But with object's list also my "gate_list" variable is too changing.

Array = Gate(gate_list)
print(Array.get_arr())
print(gate_list)

Output

[['a', 1], ['b', 0], ['c', 0], ['z', 1], ['d', 1]]
[['a', 1], ['b', 0], ['c', 0], ['z', 1], ['d', 1]]

Where is my fault?

... because they are the same list.

juanpa.arrivillaga
– juanpa.arrivillaga

2017-12-19 00:06:11 +00:00
Commented Dec 19, 2017 at 0:06 — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Dec 19, 2017 at 0:06

Ajax1234 · Accepted Answer · 2017-12-19 00:00:44Z

1

self.arr has a reference to gate_list, which is passed to the constructor. Thus, any mutations of self.arr will also change gate_list. Instead, pass a copy of gate_list to Gate:

import copy

Array = Gate(copy.deepcopy(gate_list))

answered Dec 19, 2017 at 0:00

Ajax1234

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