How to create a chart with Google Chart API

The example shows how to create a scatter plot using the Google Chart API.

import random
import urllib

def list2String(x):
 """ from a list like [1,2,5]
     return a string like '1,2,5' """
 data = ""
 for i in x:
  data += str(i)+","
 return data[0:len(data)-1]

def makeChart(x,y,filename):
 query_url = "http://chart.apis.google.com/chart?chxt=x,y&chs=300x200&cht=s&chd=t:"
 query_url += list2String(x)+"|"+list2String(y)
 chart = urllib.urlopen(query_url) # retrieve the chart
 print "saving",query_url
 f = open(filename,"wb")
 f.write(chart.read()) # save the pic
 f.close()

x = random.sample(range(0,100),10) # list with
y = random.sample(range(0,100),10) # random values in [0 100[
makeChart(x,y,"chart.png")

You can embed the picture in a web page:

<img alt="Google chart example" src="http://chart.apis.google.com/chart?chxt=x,y&amp;chs=300x200&amp;cht=s&amp;chd=t:64,10,18,42,49,83,73,27,44,51|77,89,13,87,27,34,38,44,22,42" />

Or use it from the disk.