'Serialize object ``obj`` to open JSON file.
.. versionadded:: 1.8
:param obj: Python object to serialize
:type obj: JSON-serializable data structure
:param file_obj: file handle
:type file_obj: ``file`` object'

@classmethod
def dump(cls, obj, file_obj):

    return json.dump(obj, file_obj, indent=2, encoding=u'utf-8')
