json.py 文件源码

def _preencode(data, magic_marker, in_coords=False, in_groups=False):
    if isinstance(data, dict):
        data = data.copy()
        for name, value in tuple(data.items()):
            if name in ('bounds', 'point', 'locations') and isinstance(value, (tuple, list)):
                data[name] = magic_marker+json.dumps(value, cls=DjangoJSONEncoder)+magic_marker
            else:
                data[name] = _preencode(value, magic_marker,
                                        in_coords=(name == 'coordinates'), in_groups=(name == 'groups'))
        return data
    elif isinstance(data, (tuple, list)):
        if (in_coords and data and isinstance(data[0], (int, float))) or in_groups:
            return magic_marker+json.dumps(data, cls=DjangoJSONEncoder)+magic_marker
        else:
            return tuple(_preencode(value, magic_marker, in_coords) for value in data)
    else:
        return data