Fix support for Python 3.14 built without zstd (aio-libs#11611)

Author: JacobHenner

CHANGES/11603.bugfix.rst

@@ -0,0 +1 @@
+Fixed Python 3.14 support when built without ``zstd`` support -- by :user:`JacobHenner`.

CONTRIBUTORS.txt

@@ -177,6 +177,7 @@ Ivan Lakovic
 Ivan Larin
 J. Nick Koston
 Jacob Champion
+Jacob Henner
 Jaesung Lee
 Jake Davis
 Jakob Ackermann

aiohttp/compression_utils.py

@@ -21,18 +21,21 @@
 except ImportError:
     HAS_BROTLI = False
 
-if sys.version_info >= (3, 14):
-    import compression.zstd  # noqa: I900
+try:
+    from compression.zstd import (  # type: ignore[import-not-found]  # noqa: I900
+        ZstdDecompressor,
+    )
 
     HAS_ZSTD = True
-else:
+except ImportError:
     try:
-        import zstandard
+        from zstandard import ZstdDecompressor
 
         HAS_ZSTD = True
     except ImportError:
         HAS_ZSTD = False
 
+
 MAX_SYNC_CHUNK_SIZE = 1024
 
 
@@ -297,13 +300,10 @@ def __init__(self) -> None:
                 "The zstd decompression is not available. "
                 "Please install `zstandard` module"
             )
-        if sys.version_info >= (3, 14):
-            self._obj = compression.zstd.ZstdDecompressor()
-        else:
-            self._obj = zstandard.ZstdDecompressor()
+        self._obj = ZstdDecompressor()
 
     def decompress_sync(self, data: bytes) -> bytes:
-        return self._obj.decompress(data)
+        return self._obj.decompress(data)  # type: ignore[no-any-return]
 
     def flush(self) -> bytes:
         return b""