As in any programming language, it is good practice to include comments in your code, to help other people (including yourself!) to work out what’s going on. Comment lines in Pyxplot scripts should begin with a hash character, as in the example

# This is a comment

Comments may also be placed on the same line as commands, as in the example

set nokey # I'll have no key on _my_ plot

In both cases, all of the characters following the hash character are ignored.