Support for Python 3.8 regex changes: `\N{name}` escape

[jamesohortle]

Feature

Python 3.8 introduces the \N{name} escape sequence. See here (scroll to the bottom of the section or CRTL+F and search for Changed in version 3.8).

It allows expressions like r"\N{KATAKANA LETTER A}" which will match "ア" and improves readability; the following strings are equivalent: r"　" == r"\u3000" == r"\N{IDEOGRAPHIC SPACE}".

It would be nice to have this feature available on the website.

[Ouims]

Python on the website needs an update as a whole because it was designed for old python, I believe this is being worked on, @firasdib ?