Christmas Light Sequencer - Raspberry Pi Mechatronics Projects - page 84

Installing the web server
In this secion, we will install a local web server on Raspberry Pi. There are diferent web
server frameworks that can be installed on the Raspberry Pi. They include Apache v2.0,
Boost, the REST framework, and so on.
Prepare for lift off
As menioned earlier, we will build a web server based on the web.py framework.
This secion is enirely referenced from web.py tutorials ( http://webpy.github.io/ ).
In order to install web.py, a Python module installer such as pip or easy_install is
required. We will install it using the following command:
sudo apt-get install python-setuptools
Engage thrusters
The web.py framework can be installed using the easy_install tool:
sudo easy_install web.py
Once the installaion is complete, it is ime to test it with a Hello World! example.
We will open a new file using a text editor available with Python IDLE and get started with a
Hello World! example for the web.py framework using the following steps:
1. The first step is to import the web.py framework:
import web
2. The next step is defining the class that will handle the landing page. In this case,
it is index :
urls = ('/','index')
3. We need to define what needs to be done when one tries to access the URL.
We will like to return the Hello world! text:
class index:
def GET(self):
return "Hello world!"
4. The next step is to ensure that a web page is set up using the web.py framework
when the Python script is launched:
if __name__ == '__main__':
app = web.application(urls, globals())
app.run()