Python Forum

what module is NoneType in? i didn't find it in the library, language, tutorial, or using documentation or in module "types".

Not sure if this answers your question but look at https://docs.python.org/3/library/stdtyp...ull-object

I think it is in module 'builtins' (with an s)

(Nov-28-2019, 05:02 AM)buran Wrote: [ -> ]Not sure if this answers your question but look at https://docs.python.org/3/library/stdtyp...ull-object

no, it does not even mention it.

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(Nov-28-2019, 12:07 PM)Gribouillis Wrote: [ -> ]I think it is in module 'builtins' (with an s)

seems to be the same thing as already there as __builtins__.

(Nov-28-2019, 03:23 PM)Skaperen Wrote: [ -> ]it does not even mention it.

Well, it does;

Quote:The Null Object¶
This object is returned by functions that don’t explicitly return a value. It supports no special operations. There is exactly one null object, named None (a built-in name). type(None)() produces the same singleton.

It is written as None.

it doesn't mention "NoneType", which is what i am looking for. see post #1.

see the discussion here: https://stackoverflow.com/a/21706626/4046632

However

>>> type(None).__module__
'builtins'

but

>>> __builtins__.NoneType
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'builtins' has no attribute 'NoneType'

Thus NoneType is hidden.

>>> __builtins__.type(None)
<class 'NoneType'>

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Also there is very interesting link in one of the comments in the SO
https://docs.python.org/3/library/typing...pe-aliases

Quote:Note that None as a type hint is a special case and is replaced by type(None).

As I understand it, in python3 NoneType is only exposed through type(None)

And the question is why @Skaperen asked this question in the first place as it starts to look very much like XY problem

You're misinterpreting the code

>>> __builtins__.type
<class 'type'>

so __builtins__.type(None) is identical to type(None)

You can add the type yourself

>>> __builtins__.NoneType = type(None)
>>> NoneType
<class 'NoneType'>

This bug report seems worth reading as well.