Why does list.remove() not behave as one might expect?

Question

from pprint import *

sites = [[\'a\',\'b\',\'c\'],[\'d\',\'e\',\'f\'],[1,2,3]]

pprint(sites)

for site in sites:
        sites.remove(site)

pprint(sites)
<         


        

Answer 1

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.

for site in sites[:]:
    sites.remove(site)