code: def _iso_num_weeks(iso_year):
      "Get the number of ISO-weeks in this year"
      year_start = _iso_year_start(iso_year)
      next_year_start = _iso_year_start(iso_year+1)
      year_num_weeks = ((next_year_start - year_start).days) // 7
      return year_num_weekf _iso_num_weeks(iso_year):
      "Get the number of ISO-weeks in this year"
      year_start = _iso_year_start(iso_year)
      next_year_start = _iso_year_start(iso_year+1)
      year_num_weeks = ((next_year_start - year_start).days) // 7
      return year_num_weeks
docs: Get the number of ISO-weeks in this year