@observe('colors')
def init_syntax_highlighting(self, changes=None):
    pyformat = PyColorize.Parser(style=self.colors, parent=self).format
    self.pycolorize = (lambda src: pyformat(src, 'str'))
@observe('colors')
def init_syntax_highlighting(self, changes=None):
    pyformat = PyColorize.Parser(style=self.colors, parent=self).format
    self.pycolorize = (lambda src: pyformat(src, 'str'))