Convert xls to CSV

xls_to_csv.py

#!/usr/local/bin/python
import openpyxl
from openpyxl.utils.exceptions import InvalidFileException
import tornado.options
import os.path
import csv
import sys
import xlrd
import datetime

def _utf8(s):
    """encode a unicode string as utf-8"""
    if isinstance(s, unicode):
        return s.encode("utf-8")
    assert isinstance(s, str), "_utf8 expected a str, not %r" % type(s)
    return s

def to_string(v):
    if v is None:
            return ''
    if isinstance(v, (int, long)):
        return str(v)
    if isinstance(v, datetime.datetime):
        return v.strftime('%Y-%m-%d')
    return _utf8(v)

if __name__ == "__main__":
    tornado.options.define("input_file", default=None, type=str)
    tornado.options.define("worksheet", default=0, type=int)
    tornado.options.define("skip_header", default=False, type=bool)
    tornado.options.parse_command_line()
    
    o = tornado.options.options
    assert os.path.exists(o.input_file)
    
    w = csv.writer(sys.stdout)
    try:
        wb = openpyxl.load_workbook(filename=o.input_file, read_only=True)
        ws = wb.worksheets[o.worksheet]
        for i, row in enumerate(ws.rows):
            if i == 0 and o.skip_header:
                continue
            w.writerow([to_string(cell.value) for cell in row])
    except InvalidFileException:
        # retry with xlrd
        wb = xlrd.open_workbook(filename=o.input_file)
        # http://xlrd.readthedocs.io/en/latest/api.html
        ws = wb.sheet_by_index(o.worksheet)
        for i, row in enumerate(ws.get_rows()):
            if i == 0 and o.skip_header:
                continue
            w.writerow([to_string(cell.value) for cell in row])

    sys.stdout.close()