Download and extract the Urwid tarball, then run the following commands in the urwid-X.Y.Z directory as root:
python setup.py install
SuSE users please note: SuSE Linux may not come with the curses library installed. You will need to install the ncurses and python-curses packages before you can use Urwid's curses_display module.
If you don't have root access or you don't want to do a system wide install, you can download and extract the Urwid tarball, then copy the inner urwid directory into the directory of each program that needs to use it.