__init__.py 文件源码

def _json_default_exact(obj):
    """Serialization handlers for types unsupported by `simplejson` 
    that try to preserve the exact data types.
    """
    classname = type(obj).__name__
    handlers = {
        'datetime': methodcaller('isoformat'),
        'date': methodcaller('isoformat'),
        'time': methodcaller('isoformat'),
        'timedelta': partial(getattrs, attrs=['days', 'seconds', 'microseconds']),
        'tuple': list,
        'set': list,
        'frozenset': list,
        'complex': partial(getattrs, attrs=['real', 'imag']),
        'Decimal': str,
        'Fraction': partial(getattrs, attrs=['numerator', 'denominator']),
        'UUID': partial(getattrs, attrs=['hex']),
    }
    if classname in handlers:
        return {"__class__": classname,
                "__value__": handlers[classname](obj)}
    elif isinstance(obj, tuple) and classname != 'tuple':
        return {"__class__": "namedtuple",
                "__value__": _dump_namedtuple(classname, obj)}
    raise TypeError(repr(obj) + " is not JSON serializable")