old_contents: from datetime import datetime
  import argparse
  import os
  
  
  def is_dir(string):
      """
      Type check for a valid directory for ArgumentParser.
      """
      if not os.path.isdir(string):
          msg = '{0} is not a directory'.format(string)
          raise argparse.ArgumentTypeError(msg)
      return string
  
  
  def is_file(string):
      """
      Type check for a valid file for ArgumentParser.
      """
      if not os.path.isfile(string):
          msg = u'{0} is not a file'.format(string)
          raise argparse.ArgumentTypeError(msg)
      return string
  
  
  def gt_zero(string):
      """
      Type check for int > 0 for ArgumentParser.
      """
      if not int(string) > 0:
          msg = u'limit must be > 0'
          raise argparse.ArgumentTypeError(msg)
      return int(string)
  
  
  def isodate(string):
      try:
          return datetime.strptime(string, '%Y-%m-%d').date()
      except ValueError:
          msg = u'date input must in the format of yyyy-mm-dd'
          raise argparse.ArgumentTypeError(msg)
  
new_contents: from __future__ import absolute_import
  
  from datetime import datetime
  import argparse as _argparse
  import os
  
  
  def is_dir(string):
      """
      Type check for a valid directory for ArgumentParser.
      """
      if not os.path.isdir(string):
          msg = '{0} is not a directory'.format(string)
          raise _argparse.ArgumentTypeError(msg)
      return string
  
  
  def is_file(string):
      """
      Type check for a valid file for ArgumentParser.
      """
      if not os.path.isfile(string):
          msg = u'{0} is not a file'.format(string)
          raise _argparse.ArgumentTypeError(msg)
      return string
  
  
  def gt_zero(string):
      """
      Type check for int > 0 for ArgumentParser.
      """
      if not int(string) > 0:
          msg = u'limit must be > 0'
          raise _argparse.ArgumentTypeError(msg)
      return int(string)
  
  
  def isodate(string):
      try:
          return datetime.strptime(string, '%Y-%m-%d').date()
      except ValueError:
          msg = u'date input must in the format of yyyy-mm-dd'
          raise _argparse.ArgumentTypeError(msg)
  
subject: Fix bug with self reference