[issue34475] functools.partial objects have no __qualname__ attribute

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Sorry, I'm out of practice. I thought I closed this when I marked it rejected.

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[issue34475] functools.partial objects have no __qualname__ attribute

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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stage:  -> resolved
status: open -> closed

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[issue34475] functools.partial objects have no __qualname__ attribute

[STINNER Victor]

STINNER Victor  added the comment:

functools.partial objects have no __qualname__ attribute, but they don't have a 
__name__ attribute neither.

$ python3
Python 3.6.6 (default, Jul 19 2018, 14:25:17) 
>>> import functools
>>> func=int
>>> p=functools.partial(func)
>>> p.__name__
AttributeError: 'functools.partial' object has no attribute '__name__'
>>> p.__qualname__
AttributeError: 'functools.partial' object has no attribute '__qualname__'
>>> repr(p)
"functools.partial()"

If you want to "inherit" the name of the "wrapped function", you may use: 
functools.update_wrapper().

I'm not sure that it's correct to inherit the name by default. 
functools.partial() creates a new function, so if it has a name, for me, it 
should be different.

I agree to close the issue, it's not a bug.

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nosy: +vstinner

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[issue34475] functools.partial objects have no __qualname__ attribute

[Chris Jerdonek]

Chris Jerdonek  added the comment:

> It shouldn't be the __qualname__ of the wrapped function

Yes, I agree with you. I was thinking it should be similar to what it would be 
for a function defined at the same location.

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[issue34475] functools.partial objects have no __qualname__ attribute

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

partial objects lack many other function attributes: __name__, __module__ (and 
__qualname__ doesn't make sense without __module__),  __annotations__, 
__get__(), etc. It would be nice to make these types more similar, but 
attributes shouldn't lie. And I am not sure what partial.__qualname__ can be. 
It shouldn't be the __qualname__ of the wrapped function, since the partial 
object differs from it, and is not accessible by same name.

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[issue34475] functools.partial objects have no __qualname__ attribute

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Okay, I thought a partial object was supposed to "look" like a function.

I'm okay with closing this.

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[issue34475] functools.partial objects have no __qualname__ attribute

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

I don't see a problem. Not all callables have the __qualname__ attribute. It is 
not the part of the protocol. The code that expects the __qualname__ attribute 
should be fixed.

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nosy: +serhiy.storchaka

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[issue34475] functools.partial objects have no __qualname__ attribute

[hongweipeng]

hongweipeng  added the comment:

partial() return an instance not class or function. Why it need __qualname__ 
attribute?

Ref: https://www.python.org/dev/peps/pep-3155/

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[issue34475] functools.partial objects have no __qualname__ attribute

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

It seems __repr__ call to partial object has qualname but I think it always 
returns "partial". Ref : 
https://github.com/python/cpython/blob/0afada163c7ef25c3a9d46ed445481fb69f2ecaf/Lib/functools.py#L276

>>> import functools
>>> int.__qualname__
'int'
>>> p = functools.partial(int)
>>> p.__qualname__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'functools.partial' object has no attribute '__qualname__'
>>> p
functools.partial()


Thanks

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[issue34475] functools.partial objects have no __qualname__ attribute

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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nosy: +xtreak

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[issue34475] functools.partial objects have no __qualname__ attribute

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Using p.func would name the function passed to functools.partial() rather than 
the partial object itself.

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[issue34475] functools.partial objects have no __qualname__ attribute

[hongweipeng]

hongweipeng  added the comment:

the functools.partial returns an instance not fun or cls.using 
`p.func.__qualname__` may be you want.

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[issue34475] functools.partial objects have no __qualname__ attribute

[Chris Jerdonek]

New submission from Chris Jerdonek :

functools.partial objects have no __qualname__ attribute. This means, for 
example, that code expecting a callable that logs the __qualname__ attribute 
can break when passed a functools.partial object.

Example:

>>> import functools
>>> int.__qualname__
'int'
>>> p = functools.partial(int)
>>> p.__qualname__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'functools.partial' object has no attribute '__qualname__'

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components: Library (Lib)
messages: 323947
nosy: chris.jerdonek
priority: normal
severity: normal
status: open
title: functools.partial objects have no __qualname__ attribute
type: enhancement
versions: Python 3.6

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