convert.py

import os
import glob
import csv
import sys

from multiprocessing import Pool, freeze_support

from xlsxwriter.workbook import Workbook

def process_csv_to_xlsx(csvfile):
    print('Processing: ' + csvfile)
    workbook = Workbook(csvfile[:-4] + '.xlsx')
    worksheet = workbook.add_worksheet()
    with open(csvfile, 'rt', encoding='utf8') as f:
        reader = csv.reader(f, delimiter='\t')
        for r, row in enumerate(reader):
            for c, col in enumerate(row):
                worksheet.write(r, c, col)
    workbook.close()
    os.remove(csvfile)

if __name__ == '__main__':
    if sys.platform.startswith('win'):
        # Hack for multiprocessing.freeze_support() to work from a
        # setuptools-generated entry point.
        freeze_support()
    print('Starting')
    sourcePath = os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])), 'source')
    print('Path to put CSV files: ' + sourcePath)
    with Pool(processes=8) as pool:
        if not os.path.exists(sourcePath):
            os.makedirs(sourcePath)
        ListOfFilenames = glob.glob(os.path.join(sourcePath, '*.csv'))
        pool.map(process_csv_to_xlsx, ListOfFilenames)

setup.py

from cx_Freeze import setup, Executable

# Dependencies are automatically detected, but it might need
# fine tuning.
buildOptions = dict(packages = [], excludes = [])

base = 'Console'

executables = [
    Executable('main.py', base=base, targetName = 'convert')
]

setup(name='CSV to XLSX',
      version = '1.0',
      description = '',
      options = dict(build_exe = buildOptions),
      executables = executables)