importlib.metadata Entrypoint has a broken _asdict

@jaraco

BPO	44893
Nosy	@jaraco, @RonnyPfannschmidt
PRs	bpo-44893: Implement EntryPoint as simple class with attributes. #30150

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-12-17.01:06:03.591>
created_at = <Date 2021-08-11.21:33:03.545>
labels = ['type-bug', 'library', '3.11']
title = 'importlib.metadata Entrypoint has a broken _asdict'
updated_at = <Date 2021-12-17.01:06:03.590>
user = 'https://github.com/RonnyPfannschmidt'

bugs.python.org fields:

activity = <Date 2021-12-17.01:06:03.590>
actor = 'jaraco'
assignee = 'none'
closed = True
closed_date = <Date 2021-12-17.01:06:03.591>
closer = 'jaraco'
components = ['Library (Lib)']
creation = <Date 2021-08-11.21:33:03.545>
creator = 'Ronny.Pfannschmidt'
dependencies = []
files = []
hgrepos = []
issue_num = 44893
keywords = ['patch']
message_count = 5.0
messages = ['399419', '399432', '408733', '408738', '408746']
nosy_count = 2.0
nosy_names = ['jaraco', 'Ronny.Pfannschmidt']
pr_nums = ['30150']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44893'
versions = ['Python 3.11']

due to

 def __iter__(self):
        """
        Supply iter so one may construct dicts of EntryPoints easily.
        """
        return iter((self.name, self))

the default namedtuple asdict method is broken

instead of returning the fields, recursive objects are returned as

(Pdb) v
EntryPoint(name='.git', value='setuptools_scm.git:parse', group='setuptools_scm.parse_scm')
(Pdb) v._asdict()
{'name': '.git', 'value': EntryPoint(name='.git', value='setuptools_scm.git:parse', group='setuptools_scm.parse_scm')}
(Pdb) type(v)
<class 'importlib.metadata.EntryPoint'>
(Pdb)

I'll probably fix the issue in importlib_metadata first (python/importlib_metadata#337).

The change as implemented for importlib_metadata involves refactorings that can't be backported, so the fix will only go into Python 3.11. I'll consider backporting a more selective fix for this issue if it's important, but I suspect there may not be, given that Ronny has reported that he's already migrated to a solution accessing by attribute.

New changeset 04deaee by Jason R. Coombs in branch 'main':
bpo-44893: Implement EntryPoint as simple class with attributes. (GH-30150)
04deaee

Expect the fix in 3.11a3.

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importlib.metadata Entrypoint has a broken _asdict #89056

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importlib.metadata Entrypoint has a broken _asdict #89056

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RonnyPfannschmidt commented on Aug 11, 2021

jaraco commented on Aug 12, 2021

jaraco commented on Dec 16, 2021

jaraco commented on Dec 16, 2021

jaraco commented on Dec 17, 2021

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