Move a character left or right in a file.

[ichabod801]

Sorry, deleted the other post.

You're not taking into account the length of the string. That is, pos only tells you how wide the left side should be, and you are setting both the left and the right side based on that. So the further left you move, the shorter the string gets, and the further right you move the longer the string gets.

I would fill in the right side by adding 0's until len(new) == len(line) - 1, and then adding a 1.