He's probably referring to this, from the article: "Isn’t it better, less cryptic, and more pythonic? a[:] feels a bit too much like Perl. Unlike with the slic

He's probably referring to this, from the article: "Isn’t it better, less cryptic, and more pythonic? a[:] feels a bit too much like Perl. Unlike with the slicing notation, those who don’t know Python will understand that b contains a list."