<method-wrapper>.__self__

[Hallvard B Furuseth]

What's the difference between a built-in method and a method-wrapper
object? Why has only the former a __self__, even though both are
tied to the object on which to perform the operation?
Why do list.pop and list.__len__ have different types at all?

[5].pop.__self__ [5]
[5].__len__.__self__

Traceback (most recent call last):

[5].pop

[5].__len__

list.pop

list.__len__

<slot wrapper '__len__' of 'list' objects>

 

[Michael Hudson]

What's the difference between a built-in method and a method-wrapper
object?

I *think* method-wrapper's are wrappers around type methods, aka
tp_wotsit slots at the C level. builtin-methods are, well, builtin
methods, similar to method's on regular Python classes but implemented
in C.

Why has only the former a __self__, even though both are tied to the
object on which to perform the operation?

Because.

Probably an oversight.

Why do list.pop and list.__len__ have different types at all?

Well, because they do See above.

If you want to really dig into this sort of thing, you're going to
need to read some source.

Cheers,
mwh

 

[Hallvard B Furuseth]

I *think* method-wrapper's are wrappers around type methods, aka
tp_wotsit slots at the C level. builtin-methods are, well, builtin
methods, similar to method's on regular Python classes but implemented
in C.
(...)
If you want to really dig into this sort of thing, you're going to
need to read some source.

Thanks.
I think I'll file it as a doc bug instead. Someone else can decide if
it's more than that