Support Python 3.12 (#471)

* Support Python 3.12

* Ensure `entries.update(...)` recieves a `dict`

On Python 3.12, the existing code did not produce a `dict` that could be
used to update `entries` whereas previous Python versions had. To
workaround this issue, manually create a `dict` that can be used to
update `entries` with a format consistent to what had been seen in
Python versions before 3.12.

.github/workflows/ci-linux.yaml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout source

.github/workflows/ci-osx.yaml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout source

.github/workflows/ci-windows.yaml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout source

docs/release.rst

@@ -19,6 +19,8 @@ Enhancements
   By :user:`Martin Durant <martindurant>`, :issue:`410`.
 * Add ``jenkins_lookup3`` checksum codec
   By :user:`Mark Kittisopkul <mkitti>`, :issue:`445`.
+* Support Python 3.12.
+  By :user:`John Kirkham <jakirkham>`, :issue:`471`.
 
 Fix
 ~~~

numcodecs/registry.py

@@ -13,7 +13,7 @@ def run_entrypoints():
     eps = entry_points()
     if hasattr(eps, 'select'):
         # If entry_points() has a select method, use that. Python 3.10+
-        entries.update(eps.select(group="numcodecs.codecs"))
+        entries.update({e.name: e for e in eps.select(group="numcodecs.codecs")})
     else:
         # Otherwise, fallback to using get
         entries.update(eps.get("numcodecs.codecs", []))