(from http://excess.org/article/2009/01/urwid-high-colour-support/ )
The latest [development version of Urwid][1]'s `raw_display` module now
supports 88 and 256-colour modes. Colour modes now also support
`underline`, `standout`, and `bold` (separate from bright colours when
available.)
The default high colour palettes include a colour cube (4x4x4 or 6x6x6)
and a gray scale (8 or 24 values.) I made the assumption that most
application developers won't care whether a user has 88 or 256 colours,
just that they have more than the usual 16. This led me to the
following naming scheme for high colours:
* `#000` .. `#fff` for colours in the colour-cube
* `g0` ... `g100` for values in the gray scale (`g#00` .. `g#ff` also
work)
* `h0` ... `h87` or `h255` for a precise colour
For colour cube and gray scale values Urwid will choose the closest
match available in the high colour mode that is active. The
[palette_test.py][2] application shows all the available values in each
mode.
When creating a palette the high-colour foreground and background
settings now follow the monochrome setting. The `standout`, `underline`
and `bold` settings may now be appended to the normal and high-colour
foreground colours with a comma, eg: `'light gray,underline'`. The
monochrome settings used to have to be in a tuple, but now a
comma-separated string will work as well: `('underline','bold')` becomes
`'underline,bold'`.
[1]: https://excess.org/hg/urwid/
[2]: https://excess.org/hg/urwid/file/a5314d585db4/palette_test.py
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