new_contents: #!/usr/bin/env python
  # coding: utf-8
  """Make dates on second Tuesday of the month for full year"""
  
  
  import datetime
  import sys
  
  
  def second_tuesday(year, month):
      """Find the second Tuesday in a month."""
      date = datetime.date(year, month, 1)
      seen = 0
      day = datetime.timedelta(days=1)
      while True:
          date += day
          if date.weekday() == 1:
              seen += 1
          if seen == 2:
              return date
  
  
  def make_dates(year):
      """Make list of second Tuesdays of `year`."""
      return [second_tuesday(year, month) for month in range(1, 13)]
  
  
  def show_date_table(year, comment_out=True):
      """Print out a table with all second Tuesdays of `year`.
  
      `comment_out` commennts out all lines with `#` so it does not show
      up in markdown.
      """
      comment = '# ' if comment_out else ''
      for date in make_dates(year):
          print(f'{comment}{date:%d.%m.%Y} | TBD |')
  
  
  def main(year=None):
      """Show table of second Tuesdays for `year`.
  
      `year` needs to be supplied via command line if `None`.
      """
      if year is None:
          try:
              year = int(sys.argv[1])
          except (IndexError, ValueError):
              print('Must specify year as command first line argument.')
              return
      show_date_table(year)
  
  
  if __name__ == '__main__':
      main()
  
subject: Add tool to make dates for second Tuesday in a month