Apply ruff/Perflint rule PERF401

PERF401 Use a list comprehension to create a transformed list

Author: DimitriPapadopoulos

src/zarr/core/array.py

@@ -2873,13 +2873,7 @@ def chunks_initialized(
     store_contents = list(
         collect_aiterator(array.store_path.store.list_prefix(prefix=array.store_path.path))
     )
-    out: list[str] = []
-
-    for chunk_key in array._iter_chunk_keys():
-        if chunk_key in store_contents:
-            out.append(chunk_key)
-
-    return tuple(out)
+    return tuple(chunk_key for chunk_key in array._iter_chunk_keys() if chunk_key in store_contents)
 
 
 def _build_parents(

src/zarr/core/metadata/v3.py

@@ -77,10 +77,7 @@ def validate_codecs(codecs: tuple[Codec, ...], dtype: DataType) -> None:
     """Check that the codecs are valid for the given dtype"""
 
     # ensure that we have at least one ArrayBytesCodec
-    abcs: list[ArrayBytesCodec] = []
-    for codec in codecs:
-        if isinstance(codec, ArrayBytesCodec):
-            abcs.append(codec)
+    abcs: list[ArrayBytesCodec] = [codec for codec in codecs if isinstance(codec, ArrayBytesCodec)]
     if len(abcs) == 0:
         raise ValueError("At least one ArrayBytesCodec is required.")
     elif len(abcs) > 1: