Get the latest stable version
The easiest way to install web.py is using easy_install:
$ easy_install web.py
If you don't have easy_install, try downloading the sources.
$ wget http://webpy.org/static/web.py-0.32.tar.gz
$ tar xvzf web.py-0.32.tar.gz
$ cd webpy
$ sudo python setup.py install
If you don't want to install web.py system-wide (or if you want to bundle web.py with your application):
$ cd your-app-dir
$ wget http://webpy.org/static/web.py-0.32.tar.gz
$ tar xvzf web.py-0.32.tar.gz
$ ln -s webpy/web .
If you are on Ubuntu Linux or Debian, you can install web.py using apt-get. But you may not get the latest as debian/ubuntu release cycles are different from web.py.
$ sudo apt-get install python-webpy
Get the latest development version
$ git clone git://github.com/webpy/webpy.git