Add official PyPy support (#79)

.github/workflows/tests.yml

@@ -4,11 +4,11 @@ on: [push, pull_request]
 
 jobs:
   tests-ubuntu:
-    name: "Test: py${{ matrix.python-version }}, Ubuntu"
+    name: "Test: ${{ matrix.python-version }}, Ubuntu"
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.9", "pypy3.10"]
 
     steps:
     - uses: actions/checkout@v4

README.md

@@ -24,7 +24,7 @@ a pre-defined interface (see [extending `itemadapter`](#extending-itemadapter)).
 
 ## Requirements
 
-* Python 3.8+
+* Python 3.8+, either the CPython implementation (default) or the PyPy implementation
 * [`scrapy`](https://scrapy.org/): optional, needed to interact with `scrapy` items
 * [`attrs`](https://pypi.org/project/attrs/): optional, needed to interact with `attrs`-based items
 * [`pydantic`](https://pypi.org/project/pydantic/): optional, needed to interact with

itemadapter/adapter.py

@@ -90,7 +90,10 @@ def __setitem__(self, field_name: str, value: Any) -> None:
     def __delitem__(self, field_name: str) -> None:
         if field_name in self._fields_dict:
             try:
-                delattr(self.item, field_name)
+                if hasattr(self.item, field_name):
+                    delattr(self.item, field_name)
+                else:
+                    raise AttributeError
             except AttributeError:
                 raise KeyError(field_name)
         else:
@@ -196,7 +199,10 @@ def __setitem__(self, field_name: str, value: Any) -> None:
     def __delitem__(self, field_name: str) -> None:
         if field_name in self.item.__fields__:
             try:
-                delattr(self.item, field_name)
+                if hasattr(self.item, field_name):
+                    delattr(self.item, field_name)
+                else:
+                    raise AttributeError
             except AttributeError:
                 raise KeyError(field_name)
         else:

setup.py

@@ -30,6 +30,8 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: Implementation :: CPython",
+        "Programming Language :: Python :: Implementation :: PyPy",
         "Framework :: Scrapy",
         "Intended Audience :: Developers",
         "Topic :: Internet :: WWW/HTTP",