Apply assorted ruff/refurb rules (FURB) (#1873)

* Apply ruff/refurb rule FURB118

FURB118 Use `operator....` instead of defining a lambda

* Apply ruff/refurb rule FURB171

FURB171 Membership test against single-item container

* Apply ruff/refurb rule FURB113

FURB113 Use `....extend(...)` instead of repeatedly calling `....append()`

---------

Co-authored-by: Joe Hamman <joe@earthmover.io>

Author: DimitriPapadopoulos

src/zarr/codecs/sharding.py

@@ -4,6 +4,7 @@
 from dataclasses import dataclass, field, replace
 from enum import Enum
 from functools import lru_cache
+from operator import itemgetter
 from typing import TYPE_CHECKING, NamedTuple
 
 import numpy as np
@@ -124,7 +125,7 @@ def is_dense(self, chunk_byte_length: int) -> bool:
                 for offset, length in self.offsets_and_lengths
                 if offset != MAX_UINT_64
             ],
-            key=lambda entry: entry[0],
+            key=itemgetter(0),
         )
 
         # Are all non-empty offsets unique?

src/zarr/common.py

@@ -3,6 +3,7 @@
 import asyncio
 import contextvars
 import functools
+import operator
 from collections.abc import Iterable
 from dataclasses import dataclass
 from enum import Enum
@@ -28,7 +29,7 @@
 
 
 def product(tup: ChunkCoords) -> int:
-    return functools.reduce(lambda x, y: x * y, tup, 1)
+    return functools.reduce(operator.mul, tup, 1)
 
 
 T = TypeVar("T", bound=tuple[Any, ...])

src/zarr/v2/meta.py

@@ -222,7 +222,7 @@ def decode_fill_value(cls, v: Any, dtype: np.dtype, object_codec: Any = None) ->
                 return -np.inf
             else:
                 return np.array(v, dtype=dtype)[()]
-        elif dtype.kind in "c":
+        elif dtype.kind == "c":
             v = (
                 cls.decode_fill_value(v[0], dtype.type().real.dtype),
                 cls.decode_fill_value(v[1], dtype.type().imag.dtype),
@@ -269,23 +269,23 @@ def encode_fill_value(cls, v: Any, dtype: np.dtype, object_codec: Any = None) ->
                 return "-Infinity"
             else:
                 return float(v)
-        elif dtype.kind in "ui":
+        elif dtype.kind in ("u", "i"):
             return int(v)
         elif dtype.kind == "b":
             return bool(v)
-        elif dtype.kind in "c":
+        elif dtype.kind == "c":
             c = cast(np.complex128, np.dtype(complex).type())
             v = (
                 cls.encode_fill_value(v.real, c.real.dtype, object_codec),
                 cls.encode_fill_value(v.imag, c.imag.dtype, object_codec),
             )
             return v
-        elif dtype.kind in "SV":
+        elif dtype.kind in ("S", "V"):
             v = str(base64.standard_b64encode(v), "ascii")
             return v
         elif dtype.kind == "U":
             return v
-        elif dtype.kind in "mM":
+        elif dtype.kind in ("m", "M"):
             return int(v.view("i8"))
         else:
             return v

tests/v2/test_core.py

@@ -1947,9 +1947,7 @@ def test_attrs_n5_keywords(self):
     def test_compressors(self):
         compressors = [None, BZ2(), Zlib(), GZip(), MsgPack()]
         if LZMA:
-            compressors.append(LZMA())
-            compressors.append(LZMA(preset=1))
-            compressors.append(LZMA(preset=6))
+            compressors.extend((LZMA(), LZMA(preset=1), LZMA(preset=6)))
         for compressor in compressors:
             a1 = self.create_array(shape=1000, chunks=100, compressor=compressor)
             a1[0:100] = 1