Python: Removing list element while iterating over list [duplicate]

Answer 1

for element in somelist:
    do_action(element)
somelist[:] = (x for x in somelist if not check(x))

If you really need to do it in one pass without copying the list

i=0
while i < len(somelist):
    element = somelist[i] 
    do_action(element)
    if check(element):
        del somelist[i]
    else:
        i+=1