dest_path = '/usr/frisby/databig/done/'
source_path = '/usr/frisby/databig/'

import os
import pdftotext

for files  in os.walk(source_path, topdown=False):
        for name in files:
                with open(source_path, name, 'rb') as input_file:
                        output_file = os.system("pdftotext '%s'" % (input_file))
                        complete_name = os.path.join(dest_path, name + '.txt')
                        f1 = open(complete_name, "w")
                        f1.write(output_file)
                        f1.close()