Remove compatibility shims for entry points.

CHANGES.rst

@@ -1,3 +1,9 @@
+v5.0.0
+======
+
+* #97, #284, #300: Removed compatibility shims for deprecated entry
+  point interfaces.
+
 v4.13.0
 =======
 

docs/using.rst

@@ -164,11 +164,10 @@ for more information on entry points, their definition, and usage.
 The "selectable" entry points were introduced in ``importlib_metadata``
 3.6 and Python 3.10. Prior to those changes, ``entry_points`` accepted
 no parameters and always returned a dictionary of entry points, keyed
-by group. For compatibility, if no parameters are passed to entry_points,
-a ``SelectableGroups`` object is returned, implementing that dict
-interface. In the future, calling ``entry_points`` with no parameters
-will return an ``EntryPoints`` object. Users should rely on the selection
-interface to retrieve entry points by group.
+by group. With ``importlib_metadata`` 5.0 and Python 3.12,
+``entry_points`` always returns an ``EntryPoints`` object. See
+`backports.entry_points_selectable <https://pypi.org/project/backports.entry_points_selectable>`_
+for compatibility options.
 
 
 .. _metadata:

importlib_metadata/__init__.py

@@ -29,7 +29,7 @@
 from importlib import import_module
 from importlib.abc import MetaPathFinder
 from itertools import starmap
-from typing import List, Mapping, Optional, Union
+from typing import List, Mapping, Optional
 
 
 __all__ = [
@@ -227,17 +227,6 @@ def _for(self, dist):
         vars(self).update(dist=dist)
         return self
 
-    def __iter__(self):
-        """
-        Supply iter so one may construct dicts of EntryPoints by name.
-        """
-        msg = (
-            "Construction of dict of EntryPoints is deprecated in "
-            "favor of EntryPoints."
-        )
-        warnings.warn(msg, DeprecationWarning)
-        return iter((self.name, self))
-
     def matches(self, **params):
         """
         EntryPoint matches the given parameters.
@@ -283,77 +272,7 @@ def __hash__(self):
         return hash(self._key())
 
 
-class DeprecatedList(list):
-    """
-    Allow an otherwise immutable object to implement mutability
-    for compatibility.
-
-    >>> recwarn = getfixture('recwarn')
-    >>> dl = DeprecatedList(range(3))
-    >>> dl[0] = 1
-    >>> dl.append(3)
-    >>> del dl[3]
-    >>> dl.reverse()
-    >>> dl.sort()
-    >>> dl.extend([4])
-    >>> dl.pop(-1)
-    4
-    >>> dl.remove(1)
-    >>> dl += [5]
-    >>> dl + [6]
-    [1, 2, 5, 6]
-    >>> dl + (6,)
-    [1, 2, 5, 6]
-    >>> dl.insert(0, 0)
-    >>> dl
-    [0, 1, 2, 5]
-    >>> dl == [0, 1, 2, 5]
-    True
-    >>> dl == (0, 1, 2, 5)
-    True
-    >>> len(recwarn)
-    1
-    """
-
-    __slots__ = ()
-
-    _warn = functools.partial(
-        warnings.warn,
-        "EntryPoints list interface is deprecated. Cast to list if needed.",
-        DeprecationWarning,
-        stacklevel=pypy_partial(2),
-    )
-
-    def _wrap_deprecated_method(method_name: str):  # type: ignore
-        def wrapped(self, *args, **kwargs):
-            self._warn()
-            return getattr(super(), method_name)(*args, **kwargs)
-
-        return method_name, wrapped
-
-    locals().update(
-        map(
-            _wrap_deprecated_method,
-            '__setitem__ __delitem__ append reverse extend pop remove '
-            '__iadd__ insert sort'.split(),
-        )
-    )
-
-    def __add__(self, other):
-        if not isinstance(other, tuple):
-            self._warn()
-            other = tuple(other)
-        return self.__class__(tuple(self) + other)
-
-    def __eq__(self, other):
-        if not isinstance(other, tuple):
-            self._warn()
-            other = tuple(other)
-
-        return tuple(self).__eq__(other)
-
-
-class EntryPoints(DeprecatedList):
+class EntryPoints(tuple):
     """
     An immutable collection of selectable EntryPoint objects.
     """
@@ -364,14 +283,6 @@ def __getitem__(self, name):  # -> EntryPoint:
         """
         Get the EntryPoint in self matching name.
         """
-        if isinstance(name, int):
-            warnings.warn(
-                "Accessing entry points by index is deprecated. "
-                "Cast to tuple if needed.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
-            return super().__getitem__(name)
         try:
             return next(iter(self.select(name=name)))
         except StopIteration:
@@ -396,10 +307,6 @@ def names(self):
     def groups(self):
         """
         Return the set of all groups of all entry points.
-
-        For coverage while SelectableGroups is present.
-        >>> EntryPoints().groups
-        set()
         """
         return {ep.group for ep in self}
 
@@ -415,101 +322,6 @@ def _from_text(text):
         )
 
 
-class Deprecated:
-    """
-    Compatibility add-in for mapping to indicate that
-    mapping behavior is deprecated.
-
-    >>> recwarn = getfixture('recwarn')
-    >>> class DeprecatedDict(Deprecated, dict): pass
-    >>> dd = DeprecatedDict(foo='bar')
-    >>> dd.get('baz', None)
-    >>> dd['foo']
-    'bar'
-    >>> list(dd)
-    ['foo']
-    >>> list(dd.keys())
-    ['foo']
-    >>> 'foo' in dd
-    True
-    >>> list(dd.values())
-    ['bar']
-    >>> len(recwarn)
-    1
-    """
-
-    _warn = functools.partial(
-        warnings.warn,
-        "SelectableGroups dict interface is deprecated. Use select.",
-        DeprecationWarning,
-        stacklevel=pypy_partial(2),
-    )
-
-    def __getitem__(self, name):
-        self._warn()
-        return super().__getitem__(name)
-
-    def get(self, name, default=None):
-        self._warn()
-        return super().get(name, default)
-
-    def __iter__(self):
-        self._warn()
-        return super().__iter__()
-
-    def __contains__(self, *args):
-        self._warn()
-        return super().__contains__(*args)
-
-    def keys(self):
-        self._warn()
-        return super().keys()
-
-    def values(self):
-        self._warn()
-        return super().values()
-
-
-class SelectableGroups(Deprecated, dict):
-    """
-    A backward- and forward-compatible result from
-    entry_points that fully implements the dict interface.
-    """
-
-    @classmethod
-    def load(cls, eps):
-        by_group = operator.attrgetter('group')
-        ordered = sorted(eps, key=by_group)
-        grouped = itertools.groupby(ordered, by_group)
-        return cls((group, EntryPoints(eps)) for group, eps in grouped)
-
-    @property
-    def _all(self):
-        """
-        Reconstruct a list of all entrypoints from the groups.
-        """
-        groups = super(Deprecated, self).values()
-        return EntryPoints(itertools.chain.from_iterable(groups))
-
-    @property
-    def groups(self):
-        return self._all.groups
-
-    @property
-    def names(self):
-        """
-        for coverage:
-        >>> SelectableGroups().names
-        set()
-        """
-        return self._all.names
-
-    def select(self, **params):
-        if not params:
-            return self
-        return self._all.select(**params)
-
-
 class PackagePath(pathlib.PurePosixPath):
     """A reference to a path in a package"""
 
@@ -1029,27 +841,19 @@ def version(distribution_name):
 """
 
 
-def entry_points(**params) -> Union[EntryPoints, SelectableGroups]:
+def entry_points(**params) -> EntryPoints:
     """Return EntryPoint objects for all installed packages.
 
     Pass selection parameters (group or name) to filter the
     result to entry points matching those properties (see
     EntryPoints.select()).
 
-    For compatibility, returns ``SelectableGroups`` object unless
-    selection parameters are supplied. In the future, this function
-    will return ``EntryPoints`` instead of ``SelectableGroups``
-    even when no selection parameters are supplied.
-
-    For maximum future compatibility, pass selection parameters
-    or invoke ``.select`` with parameters on the result.
-
-    :return: EntryPoints or SelectableGroups for all installed packages.
+    :return: EntryPoints for all installed packages.
     """
     eps = itertools.chain.from_iterable(
         dist.entry_points for dist in _unique(distributions())
     )
-    return SelectableGroups.load(eps).select(**params)
+    return EntryPoints(eps).select(**params)
 
 
 def files(distribution_name):

pyproject.toml

@@ -14,7 +14,8 @@ addopts = "--black"
 addopts = "--mypy"
 
 [tool.pytest-enabler.flake8]
-addopts = "--flake8"
+# disabled due to PyCQA/flake8#1438
+# addopts = "--flake8"
 
 [tool.pytest-enabler.cov]
 addopts = "--cov"

tests/test_api.py

@@ -124,62 +124,6 @@ def test_entry_points_missing_name(self):
     def test_entry_points_missing_group(self):
         assert entry_points(group='missing') == ()
 
-    def test_entry_points_dict_construction(self):
-        """
-        Prior versions of entry_points() returned simple lists and
-        allowed casting those lists into maps by name using ``dict()``.
-        Capture this now deprecated use-case.
-        """
-        with suppress_known_deprecation() as caught:
-            eps = dict(entry_points(group='entries'))
-
-        assert 'main' in eps
-        assert eps['main'] == entry_points(group='entries')['main']
-
-        # check warning
-        expected = next(iter(caught))
-        assert expected.category is DeprecationWarning
-        assert "Construction of dict of EntryPoints is deprecated" in str(expected)
-
-    def test_entry_points_by_index(self):
-        """
-        Prior versions of Distribution.entry_points would return a
-        tuple that allowed access by index.
-        Capture this now deprecated use-case
-        See python/importlib_metadata#300 and bpo-44246.
-        """
-        eps = distribution('distinfo-pkg').entry_points
-        with suppress_known_deprecation() as caught:
-            eps[0]
-
-        # check warning
-        expected = next(iter(caught))
-        assert expected.category is DeprecationWarning
-        assert "Accessing entry points by index is deprecated" in str(expected)
-
-    def test_entry_points_groups_getitem(self):
-        """
-        Prior versions of entry_points() returned a dict. Ensure
-        that callers using '.__getitem__()' are supported but warned to
-        migrate.
-        """
-        with suppress_known_deprecation():
-            entry_points()['entries'] == entry_points(group='entries')
-
-            with self.assertRaises(KeyError):
-                entry_points()['missing']
-
-    def test_entry_points_groups_get(self):
-        """
-        Prior versions of entry_points() returned a dict. Ensure
-        that callers using '.get()' are supported but warned to
-        migrate.
-        """
-        with suppress_known_deprecation():
-            entry_points().get('missing', 'default') == 'default'
-            entry_points().get('entries', 'default') == entry_points()['entries']
-            entry_points().get('missing', ()) == ()
-
     def test_entry_points_allows_no_attributes(self):
         ep = entry_points().select(group='entries', name='main')
         with self.assertRaises(AttributeError):

tests/test_main.py

@@ -1,8 +1,6 @@
 import re
-import json
 import pickle
 import unittest
-import warnings
 import importlib
 import importlib_metadata
 import pyfakefs.fake_filesystem_unittest as ffs
@@ -259,14 +257,6 @@ def test_hashable(self):
         """EntryPoints should be hashable"""
         hash(self.ep)
 
-    def test_json_dump(self):
-        """
-        json should not expect to be able to dump an EntryPoint
-        """
-        with self.assertRaises(Exception):
-            with warnings.catch_warnings(record=True):
-                json.dumps(self.ep)
-
     def test_module(self):
         assert self.ep.module == 'value'