Python-сообщество

a = [[0, 1],
     [2, 3],
     [4, 5]]
b = a
b[0][0] = 6
print(a)
>> [[6, 1], [2, 3], [4, 5]]

a =[[0,1],[2,3]]
b = []
for i in range(len(a)):
    b += [a[i].copy()]
b[0][0] = 7

  
>>> a = [[0, 1],
...      [2, 3],
...      [4, 5]]
>>> 
>>> b = [i[:] for i in a]
>>> b
[[0, 1], [2, 3], [4, 5]]
>>> 
>>> b[0][0] = 10
>>> a
[[0, 1], [2, 3], [4, 5]]
>>> b
[[10, 1], [2, 3], [4, 5]]
>>>