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Check if errors were printed during installation. Check list of modules installed in CMD window with "pip list"

Test import command in python, in CMD window:

c:\..>python
>>import xlsxwriter

No error messages if able to import.

Test a simple code (works in python 3.9):

import xlsxwriter

workbook = xlsxwriter.Workbook('arrays.xlsx')
worksheet = workbook.add_worksheet('test')

array = [['a1', 'a2', 'a3'],
         ['a4', 'a5', 'a6'],
         ['a7', 'a8', 'a9'],
         ['a10', 'a11', 'a12', 'a13', 'a14']]

row = 0

for col, data in enumerate(array):
    worksheet.write_column(row, col, data)

workbook.close()