Spaceship

[Windspar]

When iterating over a list. Then remove item from same list. Will cause next item to be skip in list.
Example. Try to remove 2 and 3. But 3 will never get check.

mylist = [1, 2, 3, 4, 5]
for i in mylist:
    print(i)
    if i in [2, 3]:
        mylist.remove(i)

print(mylist)

You have two options.
You can copy the list or you can create a list for deletion.

mylist = [1, 2, 3, 4, 5]
removelist = []
for i in mylist:
    print(i)
    if i in [2, 3]:
        removelist.append(i)

for r in removelist:
    mylist.remove(r)

print(mylist)

mylist = [1, 2, 3, 4, 5]
# shallow copy
for i in mylist[:]:
    print(i)
    if i in [2, 3]:
        mylist.remove(i)

print(mylist)