'Why is there a difference in the results of both the for loops?

Both of the for loops are the exact same but i dont understand why the first for loop isnt working.

t = [[1,0],[2,0]]
z =  [[1,0],[2,0]]
for i in t:
    i = [x for x in i if x!=0]
for i in range(len(z)):
    z[i] = [x for x in z[i] if x!=0]
print(t)
print(z)

Output:

[[1, 0], [2, 0]]

[[1], [2]]

pythonarrayslistfor-loop


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