line 14 should be
chars = string.ascii_letters + string.digitsthe comment is there just for that - to show/comment what chars would be. Normally one would put it on the previous line, e.g.
chars = string.ascii_letters + string.digits # 'abcdefghijklmnopqrstuvwxyz0123456789Note that you have also problems with the indentation of the body of the while loop as well with the try/except. Try to fix these yourself
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