Never change list while iterating over it. Iterate over copy of the list.
EDIT: Although correct statement, my answer does not address OP problem. look at @snippsat post below.
EDIT: Although correct statement, my answer does not address OP problem. look at @snippsat post below.
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs