types.py 文件源码

def __new__(cls, *args, **kwargs):
        if cls in _SymbolCache:
            options = kwargs.get('options', {})
            newobj = sympy.Function.__new__(cls, *args, **options)
            newobj._cached_init()
        else:
            name = kwargs.get('name')
            if len(args) < 1:
                args = cls._indices(**kwargs)

            # Create the new Function object and invoke __init__
            newcls = cls._symbol_type(name)
            options = kwargs.get('options', {})
            newobj = sympy.Function.__new__(newcls, *args, **options)
            newobj.__init__(*args, **kwargs)

            # All objects cached on the AbstractFunction /newobj/ keep a reference
            # to /newobj/ through the /function/ field. Thus, all indexified
            # object will point to /newobj/, the "actual Function".
            newobj.function = newobj

            # Store new instance in symbol cache
            newcls._cache_put(newobj)
        return newobj