Demo: display the air pollution level

After I posted the UV Index demo, a kind person pointed me to some live air pollution data helpfully supplied by the government of Hong Kong.  It was a very straightforward matter – using the awesome feedparser Python module – to extract the air pollution level for Central Hong Kong, and convert that to a color which is then displayed on the Light:

#!/usr/bin/python
#
import feedparser
import sys, urllib2, string

d = feedparser.parse('http://data.one.gov.hk/dataset/2/en')

for entry in d.entries:
	parts = string.split(entry.title, ' : ')
	if parts[0] == u'Central':
		pollution = parts[2]

colorval = 0x808080

# Map the value based on the value provided in the feed
if (pollution == u'High'):
	colorval = 0xFFFF80
if (pollution == u'Very High'):
	colorval = 0x80FF80
if (pollution == u'Low'):
	colorval = 0xFF8080

colorstr = "http://localhost/cgi-bin/ajaxcolor?color=0x%6x" % colorval
print colorstr
e = urllib2.urlopen(colorstr)