render the weeks of year

render_weeks.py

import csv

import arrow


def range_week(year):
    fmt = 'YYYY-MM-DD'
    span = arrow.Arrow.span_range('week', arrow.get(
        '%s-01-01' % year), arrow.get('%s-12-31' % year))
    with open('./weeks.csv', 'w+') as files:
        csv_writer = csv.writer(files)
        csv_writer.writerow(('week', 'start', 'end'))

        for start, end in span:
            week_no = start.format('W '+fmt).split(' ')[0][:-2]
            datas = week_no.split('-')[1:]
            datas.append(start.format(fmt))
            datas.append(end.format(fmt))

            csv_writer.writerow(datas)


if __name__ == '__main__':
    range_week(year=2021)