[issue12915] Add inspect.locate and inspect.resolve

[Rahul Jha]

Change by Rahul Jha :


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[issue12915] Add inspect.locate and inspect.resolve

[STINNER Victor]

Change by STINNER Victor :


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[issue12915] Add inspect.locate and inspect.resolve

[Ned Deily]

Ned Deily  added the comment:

See bpo-41154 for possible regression introduced by these changes.

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[issue12915] Add inspect.locate and inspect.resolve

[STINNER Victor]

STINNER Victor  added the comment:

I understand that all known issues are now fixed, so I close the issue.

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[issue12915] Add inspect.locate and inspect.resolve

[STINNER Victor]

STINNER Victor  added the comment:


New changeset e0acec15412203359d59db33e447698ee51e07fc by Michael Felt in 
branch 'master':
bpo-12915: Skip test_pkgutil.test_name_resolution() non-encodable filenames 
(GH-18720)
https://github.com/python/cpython/commit/e0acec15412203359d59db33e447698ee51e07fc


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[issue12915] Add inspect.locate and inspect.resolve

[Michael Felt]

Change by Michael Felt :


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stage: resolved -> patch review
pull_request: https://github.com/python/cpython/pull/18720

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[issue12915] Add inspect.locate and inspect.resolve

[Michael Felt]

Michael Felt  added the comment:

I am very busy with normal work this week. However I’ll attempt to add a pr 
with your (Victor”s)  suggestion. 

Sent from my iPhone

> On 29 Feb 2020, at 23:36, STINNER Victor  wrote:
> 
> 
> STINNER Victor  added the comment:
> 
>> File 
>> "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_pkgutil.py",
>>  line 249, in test_name_resolution
>>   os.makedirs(d, exist_ok=True)
> (...)
>> UnicodeEncodeError: 'latin-1' codec can't encode characters in position 
>> 17-19: ordinal not in range(256)
> 
> The test should be modified to skip the current uw value in the loop 
> ("continue") if the filesystem encoding cannot encode the Unicode string 
> (catch UnicodeEncodeError on the makedirs() call).
> 
> --
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[issue12915] Add inspect.locate and inspect.resolve

[STINNER Victor]

STINNER Victor  added the comment:

> File 
> "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_pkgutil.py",
>  line 249, in test_name_resolution
>os.makedirs(d, exist_ok=True)
(...)
> UnicodeEncodeError: 'latin-1' codec can't encode characters in position 
> 17-19: ordinal not in range(256)

The test should be modified to skip the current uw value in the loop 
("continue") if the filesystem encoding cannot encode the Unicode string (catch 
UnicodeEncodeError on the makedirs() call).

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[issue12915] Add inspect.locate and inspect.resolve

[Michael Felt]

Michael Felt  added the comment:

PR18517 has, likely, a utf-8 dependency. AIX, default latin-1 does not accept 
the new test.

Starting with this merge AIX bot fails with:
==
ERROR: test_name_resolution (test.test_pkgutil.PkgutilTests)
--
Traceback (most recent call last):
  File 
"/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_pkgutil.py",
 line 249, in test_name_resolution
os.makedirs(d, exist_ok=True)
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/os.py", line 
223, in makedirs
mkdir(name, mode)
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 17-19: 
ordinal not in range(256)

Not completely resolved.

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:


New changeset 4f17c5cd9a1ec50fe8de7ef68c39220a01a862cb by Vinay Sajip in branch 
'master':
bpo-12915: Improve Unicode support for package names and attributes. (GH-18517)
https://github.com/python/cpython/commit/4f17c5cd9a1ec50fe8de7ef68c39220a01a862cb


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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:

> I'm not sure how to design the regex.

Did you not look at the PR I added to address this (Unicode chars), with a 
regex change? I added you as a reviewer.

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[issue12915] Add inspect.locate and inspect.resolve

[STINNER Victor]

STINNER Victor  added the comment:

I reopen the issue to discuss the non-ASCII identifiers.

Currently, the code uses [a-z_]\w*, but "é" is a valid Python module name for 
example:

$ echo 'print("here")' > é.py
$ python3 -c 'import é'
here

I'm not sure how to design the regex. I just reported a potential issue ;-) See 
the PEP 3131 and str.isidentifier() method:
https://docs.python.org/dev/library/stdtypes.html#str.isidentifier

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Change by Vinay Sajip :


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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:

To be more precise, one could use

^(?!\d)(\w+)(\.(?!\d)(\w+))* for _DOTTED_WORDS and use the re.U flag when 
compiling the pattern. That should match any packages where segments start with 
a letter and continue with alphanumerics. Do you agree?

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:

> The regex looks too strict. Python 3 accepts non-ASCII module names.

Would adding the re.U flag be enough, or are you thinking of other 
possibilities?

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[issue12915] Add inspect.locate and inspect.resolve

[STINNER Victor]

STINNER Victor  added the comment:

The regex looks too strict. Python 3 accepts non-ASCII module names.

Should existing functions be modified to reuse the new function?

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Change by Vinay Sajip :


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status: open -> closed
versions: +Python 3.9 -Python 3.5

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:


New changeset 1ed61617a4a6632905ad6a0b440cd2cafb8b6414 by Vinay Sajip in branch 
'master':
bpo-12915: Add pkgutil.resolve_name (GH-18310)
https://github.com/python/cpython/commit/1ed61617a4a6632905ad6a0b440cd2cafb8b6414


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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Change by Vinay Sajip :


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[issue12915] Add inspect.locate and inspect.resolve

[Berker Peksag]

Berker Peksag  added the comment:

FTR, Django has a similar helper:

from django.utils.module_loading import import_string

ValidationError = import_string('django.core.exceptions.ValidationError')

https://docs.djangoproject.com/en/3.0/ref/utils/#django.utils.module_loading.import_string

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:

> With the lack of support, I suggest closing this.

Well, the lack of support is just for adding to importlib. It still seems 
useful to refactor it out ... just not clear where the best place is. Perhaps 
pkgutil? It's definitely useful to have in the stdlib in one place. I'll come 
up with a PR soon.

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[issue12915] Add inspect.locate and inspect.resolve

[Éric Araujo]

Éric Araujo  added the comment:

With the lack of support, I suggest closing this.

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[issue12915] Add inspect.locate and inspect.resolve

[Brett Cannon]

Change by Brett Cannon :


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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip added the comment:

Another question to consider: is inspect the best place for this? I don't think 
it is, because

(a) It's not really an inspection facility
(b) Importing inspect to get this functionality would pull in lots
of stuff which wouldn't be used in the typical use case.

I think it makes more sense for it to be in importlib. Accordingly adding Brett 
to nosy, for his thoughts.

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[issue12915] Add inspect.locate and inspect.resolve

[Brett Cannon]

Brett Cannon added the comment:

importlib.util.resolve_name() already exists for resolving an explicit relative 
import name to an absolute one, so closing this as out of date.

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip added the comment:

 importlib.util.resolve_name() already exists

But that's not what the proposed functionality is for, is it? This covers 
finding values inside an imported module which can be accessed via a dotted 
path from the module globals.

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[issue12915] Add inspect.locate and inspect.resolve

[Brett Cannon]

Brett Cannon added the comment:

Importlib already has importlib.import_module() (since Python 2.7) and that's 
as far as I'm willing to go for finding a module by name. Anything past that is 
a getarr() call on the resulting module and thus not worth adding to importlib.

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip added the comment:

 and thus not worth adding to importlib.

Okay, fair enough. It's not purely an import function, though partly related to 
imports.

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[issue12915] Add inspect.locate and inspect.resolve

[Yury Selivanov]

Changes by Yury Selivanov yselivanov...@gmail.com:


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versions: +Python 3.5 -Python 3.4

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[issue12915] Add inspect.locate and inspect.resolve

[Ezio Melotti]

Ezio Melotti added the comment:

Can you provide a couple of examples of that notation?

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip added the comment:

 Can you provide a couple of examples of that notation?

entry_points = 
[console_scripts]
pybabel = babel.messages.frontend:main

[distutils.commands]
compile_catalog = babel.messages.frontend:compile_catalog
extract_messages = babel.messages.frontend:extract_messages
init_catalog = babel.messages.frontend:init_catalog
update_catalog = babel.messages.frontend:update_catalog

[distutils.setup_keywords]
message_extractors = babel.messages.frontend:check_message_extractors

[babel.checkers]
num_plurals = babel.messages.checkers:num_plurals
python_format = babel.messages.checkers:python_format

[babel.extractors]
ignore = babel.messages.extract:extract_nothing
python = babel.messages.extract:extract_python
javascript = babel.messages.extract:extract_javascript


Source:

http://babel.edgewall.org/browser/trunk/setup.py#L38

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[issue12915] Add inspect.locate and inspect.resolve

[Nick Coghlan]

Nick Coghlan added the comment:

Something to consider with these functions: it is probably desirable to also 
support the popular alternate notation which uses an explicit : to separate 
the module name from the reference within the module.

For example, setuptools entry points and nose test references both use that 
format.

The alternate notation should be fairly easy to both detect and handle through 
name.partition(':')

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[issue12915] Add inspect.locate and inspect.resolve

[Meador Inge]

Changes by Meador Inge mead...@gmail.com:


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[issue12915] Add inspect.locate and inspect.resolve

[Berker Peksag]

Berker Peksag added the comment:

Attaching new patch to address Vinay Sajip's suggestions on Rietveld. Thank 
you, Vinay.

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Added file: http://bugs.python.org/file28500/issue12915_v2.diff

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[issue12915] Add inspect.locate and inspect.resolve

[Berker Peksag]

Changes by Berker Peksag berker.pek...@gmail.com:


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Added file: http://bugs.python.org/file28277/issue12915.diff

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[issue12915] Add inspect.locate and inspect.resolve

[Daniel Urban]

Changes by Daniel Urban urban.dani...@gmail.com:


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[issue12915] Add inspect.locate and inspect.resolve

[Roundup Robot]

Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 5df1065ddb8b by Éric Araujo in branch 'default':
Expand tests and fix bugs in util.resolve_name.
http://hg.python.org/distutils2/rev/5df1065ddb8b

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip vinay_sa...@yahoo.co.uk added the comment:

The version in logging.config appears to be doing the same job, but is shorter:

def _resolve(name):
Resolve a dotted name to a global object.
name = name.split('.')
used = name.pop(0)
found = __import__(used)
for n in name:
used = used + '.' + n
try:
found = getattr(found, n)
except AttributeError:
__import__(used)
found = getattr(found, n)
return found

The line used = used + '.' + n could of course be improved.

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[issue12915] Add inspect.locate and inspect.resolve

[Roundup Robot]

Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 1405df4a1535 by Éric Araujo in branch 'default':
Expand tests and fix bugs in packaging.util.resolve_name.
http://hg.python.org/cpython/rev/1405df4a1535

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[issue12915] Add inspect.locate and inspect.resolve

[Eric Snow]

Changes by Eric Snow ericsnowcurren...@gmail.com:


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[issue12915] Add inspect.locate and inspect.resolve

[Éric Araujo]

Éric Araujo mer...@netwok.org added the comment:

In addition, error handling/reporting is not trivial to get right.  We’ve had 
to fix the code in distutils2 and it’s still not quite right (#12703).

I opened this report because I’d like to see all stdlib modules use the same 
functions and I’d prefer people to copy-paste the same robust code for 
backports.

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[issue12915] Add inspect.locate and inspect.resolve

[Éric Araujo]

Éric Araujo mer...@netwok.org added the comment:

Sorry if I was unclear; the functions work with a dotted name as a string and 
resolve it to an object.  __import__ works with module, whereas this kind of 
functions work with mod.name, pkg.mod.name.attr, etc., that is, they combine 
import and getattr.

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[issue12915] Add inspect.locate and inspect.resolve

[Daniel Urban]

Changes by Daniel Urban urban.dani...@gmail.com:


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[issue12915] Add inspect.locate and inspect.resolve

[Terry J. Reedy]

Terry J. Reedy tjre...@udel.edu added the comment:

To be a little clearer, this is about dotted import names, not regular dotted 
names.
pydoc.locate(path, forceload=0):
  Locate an object by name or dotted path, importing as necessary
pydoc.resolve(thing, forceload=0):
  Given an object or a path to an object, get the object and its name. 

It is not completely clear to me how this is different from using __import__ 
but I will believe it is. It something like this is in at least 3 places, +1 on 
factoring it out to one place.

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[issue12915] Add inspect.locate and inspect.resolve

[Ezio Melotti]

Changes by Ezio Melotti ezio.melo...@gmail.com:


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[issue12915] Add inspect.locate and inspect.resolve

[Andreas Stührk]

Changes by Andreas Stührk andy-pyt...@hammerhartes.de:


--
nosy: +Trundle

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[issue12915] Add inspect.locate and inspect.resolve

[Éric Araujo]

New submission from Éric Araujo mer...@netwok.org:

The need to resolve a dotted name to a Python object is spreading in the 
stdlib: pydoc has locate and resolve, packaging has util.resolve_name, unittest 
has something else, etc.  For the benefit of stdlib maintainers as well as the 
community, I think such functionality should be exposed publicly by the inspect 
module.

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components: Library (Lib)
messages: 143626
nosy: eric.araujo
priority: normal
severity: normal
status: open
title: Add inspect.locate and inspect.resolve
type: feature request
versions: Python 3.3

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