@classmethod
    def class_get_trait_help(cls, trait):
        """Get the help string for a single trait."""
        lines = []
        header = "--%s.%s=<%s>" % (cls.__name__, trait.name, trait.__class__.__name__)
        lines.append(header)
        try:
            dvr = repr(trait.get_default_value())
        except Exception:
            dvr = None # ignore defaults we can't construct
        if dvr is not None:
            if len(dvr) > 64:
                dvr = dvr[:61]+'...'
            lines.append(indent('Default: %s'%dvr, 4))
        if trait.__class__.__name__ in 'Enum':
            # include Enum choices
            lines.append(indent('Choices: %r'%(trait.values,)))
        
        help = trait.get_metadata('help')
        if help is not None:
            help = '\n'.join(wrap_paragraphs(help, 76))
            lines.append(indent(help, 4))
        return '\n'.join(lines)
dataset/ETHPy150Open ipython/ipython-py3k/IPython/config/configurable.py/Configurable.class_get_trait_help/swapped operands of `in`