Command Executor

from __future__ import annotations


class Command:
    def __init__(self, arr, value):
        self.arr = arr
        self.multiplier = value

    commands = []

    def PushIn(self, command):
        self.commands.append(command)

    def pop(self):
        self.commands.pop()

    def execute(self):
        for i in range(len(self.arr)):
            for j in range(len(self.arr[i])):
                self.arr[i][j] += self.multiplier
        return self.arr

    def redo(self):
        for i in range(len(self.arr)):
            for j in range(len(self.arr[i])):
                self.arr[i][j] += self.multiplier
            self.PushIn(self.execute())

    def undo(self):
        for i in range(len(self.arr)):
            for j in range(len(self.arr[i])):
                self.arr[i][j] -= self.multiplier
            self.commands.pop()


class CommandExecutor:



class App:
    def PrintArray(arr):
        for i in range(len(arr)):
            print(*arr[i])

    def main(self):
        print('starting')
        arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
        plus = Command(arr, 5)
        plus.execute()
        self.PrintArray(arr)


App.main()