old_contents: #!/usr/bin/env python3
  
  '''
  Given:
  1. status code: (0 - OK, other value - BAD)
  2. terminal window width
  3. (optional) Text to display (without color)
  
  shows red/green bar to visualize return code of previous command
  '''
  
  import sys
  
  def main():
      if len(sys.argv) >= 2:
          code = sys.argv[1]
          if code == 'x':
              col_char = '3'
              cols_limit = 78
              code = '' # No code provided - only yellow bar
          else:
              if code == 'y':
                  col_char = '3'
              else:
                  value = int(code)
                  if value:
                      col_char = '1'
                  else:
                      col_char = '2'
              cols_limit = int(sys.argv[2])
          if len(sys.argv) >= 4:
              start_text = sys.argv[3] + ' '
          else:
              start_text = ''
          esc = chr(27)
          print(''.join((
              start_text,
              esc,
              '[4',
              col_char,
              'm',
              ' ' * (cols_limit - 2 - len(code) - len(start_text)),
              code,
              esc,
              '[0m',
              )))
      else:
          print('''
      Usage: %(prog_name)s status_code number_of_columns
  
      1. status code: 0 - OK (green color), other values - BAD (red color)
      2. number of columns: the width of text console
      3. (optional) Text to display
      ''' % dict(
              prog_name=sys.argv[0],
              ))
  
new_contents: #!/usr/bin/env python3
  
  '''
  Given:
  1. status code: (0 - OK, other value - BAD)
  2. terminal window width
  3. (optional) Text to display (without color)
  
  shows red/green bar to visualize return code of previous command
  '''
  
  import sys
  
  esc = chr(27)
  
  def main():
      if len(sys.argv) >= 2:
          code = sys.argv[1]
          if code == 'x':
              col_char = '3'
              cols_limit = 78
              code = '' # No code provided - only yellow bar
          else:
              if code == 'y':
                  col_char = '3'
              else:
                  value = int(code)
                  if value:
                      col_char = '1'
                  else:
                      col_char = '2'
              cols_limit = int(sys.argv[2])
          if len(sys.argv) >= 4:
              start_text = sys.argv[3] + ' '
          else:
              start_text = ''
          esc = chr(27)
          print(''.join((
              start_text,
              esc,
              '[4',
              col_char,
              'm',
              ' ' * (cols_limit - 2 - len(code) - len(start_text)),
              code,
              esc,
              '[0m',
              )))
      else:
          print('''
      Usage: %(prog_name)s status_code number_of_columns
  
      1. status code: 0 - OK (green color), other values - BAD (red color)
      2. number of columns: the width of text console
      3. (optional) Text to display
      ''' % dict(
              prog_name=sys.argv[0],
              ))
  
subject: Add esc on global level