[Python] Strange result when removing item from a list while iterating over it in Python

I've got this piece of code:

numbers = list(range(1, 50))

for i in numbers:
if i < 20:
numbers.remove(i)

print(numbers)


But, the result I'm getting is:
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49]

Of course, I'm expecting the numbers below 20 to not appear in the results. Looks like I'm doing something wrong with the remove.

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