cached_property can be provided by stdlib

Author: oprypin

mkdocstrings/handlers/crystal/items.py

@@ -6,7 +6,10 @@
 import re
 from typing import Any, Generic, Iterator, Mapping, Optional, Sequence, TypeVar, Union
 
-from cached_property import cached_property
+try:
+    from functools import cached_property
+except ImportError:
+    from cached_property import cached_property
 from mkdocstrings.handlers.base import CollectionError
 
 from . import crystal_html

pyproject.toml

@@ -20,7 +20,7 @@ mkdocstrings = ">=0.15.0"
 markdown-callouts = ">=0.1.0"
 mkdocs-autorefs = ">=0.2.0"
 markupsafe = ">=1.1.1, <3.0"
-cached-property = "^1.5.2"
+cached-property = "^1.5.2; python_version<'3.8'"
 Jinja2 = ">=2.11.2, <4.0"
 
 [tool.poetry.dev-dependencies]