[Python] Can't print a self-made matrix outside of its module

I have 2 modules in my project:

1- Ant.py

from threading import Thread
from Ant_farm import Ant_farm

ant_farm = Ant_farm(20, 20)

class Ant(Thread):
def __init__(self, x, y):
global ant_farm

Thread.__init__(self)
self.x = x
self.y = y
ant_farm.matrix[self.x][self.y] = True # At this point the arguments has initialized?


def move(self, x, y):
ant_farm.matrix[self.x][self.y] = False
self.x = x
self.y = y
ant_farm.matrix[self.x][self.y] = True # At this point the value has changed?

def run(self):
while True:
ant_farm.move_ant(self)

t = Ant(0, 0)
print(ant_farm[0][0])
t.move(1, 0)


2- Ant_farm.py

from threading import Condition

def matrix(x, y):
return [[False for j in range(y)] for i in range(x)]

class Ant_farm():
def __init__(self, x, y):
self.c = Condition() # I don't know if I have to put "self" before
self.matrix = matrix(x, y)

def move_ant(self, ant):
new_pos = {0: tuple(x0, y0 - 1),
1: tuple(x0 + 1, y0),
2: tuple(x0, y0 + 1),
3: tuple(x0 - 1, y0)}
x0, y0 = ant.x, ant.y
x1, y1 = new_pos[random.randrange(0, 4)]
with self.c:
try:
while self.matrix[x1][y1]:
self.c.wait()
self.matrix[x0][y0] = False
ant.move(x1, y1)
# It's not end and I have to review

except Exception: # Which exceptions can appear?
pass

def __str__(self):
pass


In both omit the comments.

When I execute the Ant module, raises this error:

AttributeError: Ant_farm instance has no attribute '_getitem_'
​

in the line 27 (print(ant_farm[0][0])). Why does this?

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