How to convert XLS to CSV files using python?

Question

I'm working with python console of QGIS 2.8.1 . I want to convert many xls files into csv format using python. My input directory is: D:\\PATRICIA\\TESTE\\XLS and output is: D:\\PATRICIA\\TESTE\\CSV2 . I wrote this code based in your suggestions ( Converting xls file into csv/txt file in Python ) and developed it in differente files with different dates 1999/01/2 until 1999/01/31 as: RR_1999_1_2.xls , RR_1999_1_3.xls , ... RR_1999_1_31.xls

I don't know why my script doesn´t works. It means that nothing happened!

My script is :

import xlrd
import csv
import datetime as dt
from datetime import timedelta

#initial and final dates 
data1='19990102'
data2='19990131'

anoi = int(data1[:4])
mesi = int(data1[4:6])
diai = int(data1[6:8])
anof = int(data2[:4])
mesf = int(data2[4:6])
diaf = int(data2[6:8])

start_date = dt.datetime(anoi, mesi, diai)
end_date = dt.datetime(anof, mesf, diaf)

total_days = (end_date - start_date).days + 1


for day in xrange(0, total_days):
        current_date = (start_date + dt.timedelta(days = day)).date()
        file_date = str(current_date.year)+'_'+str(current_date.month)+'_'+str(current_date.day)

        srt1='D:/PATRICIA/TESTE/XLS/RR_'+file_date+'.xls'
        srt2='D:/PATRICIA/TESTE/CSV2/RR_'+file_date+'.csv'

        def xls_to_csv():

            x =  xlrd.open_workbook(str1)
            x1 = x.sheet_by_name('Sheet1')
            csvfile = open(str2, 'wb')
            writecsv = csv.writer(csvfile, quoting=csv.QUOTE_ALL)

            for rownum in xrange(sh.nrows):
                writecsv.writerow(x1.row_values(rownum))

            csvfile.close()

Any help?

Thanks.

Answer 1

Unless I've missed an important thing, you declare the function xls_to_csv in a loop, but never call it. The general structure of your script should be:

#initializations
data1='19990102'
...
total_days = (end_date - start_date).days + 1

# function definition:
def xls_to_csv(str1, str2):
    x =  xlrd.open_workbook(str1)
    x1 = x.sheet_by_name('Sheet1')
    csvfile = open(str2, 'wb')
    writecsv = csv.writer(csvfile, quoting=csv.QUOTE_ALL)

    for rownum in xrange(sh.nrows):
        writecsv.writerow(x1.row_values(rownum))

    csvfile.close()

# loop
for day in xrange(0, total_days):
        current_date = (start_date + dt.timedelta(days = day)).date()
        file_date = str(current_date.year)+'_'+str(current_date.month)+'_'+str(current_date.day)

        srt1='D:/PATRICIA/TESTE/XLS/RR_'+file_date+'.xls'
        srt2='D:/PATRICIA/TESTE/CSV2/RR_'+file_date+'.csv'
        xls_to_csv(srt1, srt2)  # function call