[Python] Why is the output for python code with remove() wrong? [duplicate]

When running this code :

list1 = [1,2,4,6,4,5,3,2,1,8,12]
for i in list1:
if i%2==0:
list1.remove(i)
print(list1)


output is : [1, 4, 4, 5, 3, 1, 12]

why is 4 and 12 still there in the output? Both 4 and 12 are divisible by 2.

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