Leaverage python csv writer and xlrd reader to do this job.
def xls2csv(inputFile,outputFile):
print "Input File : %s" %(inputFile)
print "Output File : %s" %(outputFile)
writer=csv.writer(open(outputFile,'w'),delimiter=',',quotechar='"')
book=xlrd.open_workbook(inputFile)
sheet=book.sheet_by_index(0)
for row in range(sheet.nrows):
writer.writerow( sheet.row_values(row))



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