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from pprint import *
sites = [['a','b','c'],['d','e','f'],[1,2,3]]
pprint(sites)
for site in sites:
sites.remove(site)
pprint(sites)
outputs:
[['a', 'b', 'c'], ['d', 'e', 'f'], [1, 2, 3]]
[['d', 'e', 'f']]
why is it not None, or an empty list [] ?
It’s because you’re modifying a list as you’re iterating over it. You should never do that.
For something like this, you should make a copy of the list and iterate over that.