How to remove some elements from an array in python?

[menator01]

Please use bbtags when posting code.

Here is one way

# Create a list
alist = [i for i in range(50)]
sorted(alist)

print(alist)
print()
# Create a copy of the list.
# Should not try to edit a list that you are iterating over
alist_copy = alist.copy()

# Iterate over the copy and remove anything above chosen number
# from original list
for index, number in enumerate(alist_copy):
    if number > 20:
        alist.remove(number)

print(alist)

Output

Output:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 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]

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]