A major part of the code I write at my day job consist of scripts, which I most often prefer to write in Python (second only to bash). I hate to admit it, but my code is rarely pretty. I just write hacky scripts. I now use pep8 and pyflakes on all the python code that I write. It does look nicer, although occasionally painful to fix ;) Almost all the time pyflakes help me catch an error in the script even before I run the script.