Code snippet to plot lots of pie charts in python

pie_ploy.py

# -*- coding: utf-8 -*-
"""
Program to plot many pie charts
Created on Tue Nov 10 15:00:39 2015

@author: shaunak
"""

from pylab import *


#read all 
f1 = open('filenames.txt','r')
f2 = open('data.txt','r')
files = f1.readlines()
data = f2.readlines()
#remove trainling returns in text files
files = [filec for filec in files if filec != '\n']
data = [datac for datac in data if datac != '\n']
f1.close()
f2.close()

#how many figures?
if len(files) < len(data):
    print "There are more datapoints then filenames. Please ensure number of file names > number of datapoints."
    raise ValueError('There are more datapoints then filenames.')    
num = len(files)

for i in range(num):
    
    # make a square figure and axes
    figure(i, figsize=(6,6))
    ax = axes([0.1, 0.1, 0.8, 0.8])
    
    
    # The slices will be ordered and plotted counter-clockwise.
    #labels = ('\\lambda_1', '\\lambda_2', '\\lambda_3')
    #fracs = [i1,i2,i3]
    fracs = [float(j) for j in data[i].split(',')]
        
    
    _,_,autotexts = pie(fracs, explode=None, labels=None,
                    autopct='%1.1f%%', shadow=False, startangle=90)

    for autotext in autotexts:
        autotext.set_color('white')
        autotext.set_fontsize('x-large')
        autotext.set_fontweight('heavy')
    #title('Eigen Values', bbox={'facecolor':'0.8', 'pad':5})
    
    savefig(files[i].rstrip('\n'))