new_contents: #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  from pygments.lexers import PythonLexer, BashLexer
  from pygments.lexer import bygroups, using
  from pygments.token import Keyword, Operator, Name, Text
  
  #-----------------------------------------------------------------------------
  # Classes
  #-----------------------------------------------------------------------------
  
  class IPythonLexer(PythonLexer):
      name = 'IPython'
      aliases = ['ip', 'ipython']
      filenames = ['*.ipy']
      tokens = PythonLexer.tokens.copy()
      tokens['root'] = [
          (r'(\%+)(\w+)\s+(\.*)(\n)', bygroups(Operator, Keyword, using(BashLexer), Text)),
          (r'(\%+)(\w+)\b', bygroups(Operator, Keyword)),
          (r'^(!)(.+)(\n)', bygroups(Operator, using(BashLexer), Text)),
      ] + tokens['root']
  
subject: add IPython lexer for pygments