[PATCH RFC] batching: new module to support batching of commands

Michael Tharp gxti at partiallystapled.com
Thu Jun 2 14:51:43 CDT 2011

On 06/02/2011 02:12 PM, Augie Fackler wrote:
> In 2.7:
>>>> class foo:
> ...  pass
> ...
>>>> isinstance(foo(), object)
> True
> ISTR this changed a while ago, perhaps as long ago as 2.4, but I can't
> find the doc right now and don't have 2.4 handy to test.

This isn't telling you that "foo" is a new-style class but rather 
answering a different question entirely:

 >>> class foo: pass
 >>> type(foo)
<type 'classobj'>
 >>> issubclass(type(foo), object)
 >>> type(foo())
<type 'instance'>
 >>> issubclass(type(foo()), object)

"classobj" is the type of all old-style classes, and "instance" is the 
type of all old-style instances, and both of these are derived from 
"object" just like every other builtin type since (I think) 2.4. They 
are not, however, indicative of a new-style class which is itself a 
type, not merely an instance of a type:

 >>> class foo2(object): pass
 >>> type(foo2)
<type 'type'>

Thus concludes our Python guts lesson for today. Study well, there 
*will* be a quiz.

-- m. tharp

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