80 character lines is perfect. Allows me a reasonable number of splits in vim and most importantly makes diffs/code that I get in my email readable. That being

80 character lines is perfect. Allows me a reasonable number of splits in vim and most importantly makes diffs/code that I get in my email readable. That being said, as with all things(especially guidelines), apply common sense liberally. Which in Python is one of the guidelines of pep8 on writing readable code.