Replace python-lzf with python-neo-lzf

environment.yml

@@ -14,6 +14,7 @@ dependencies:
   - flask-cors
   - h5netcdf
   - h5py  # link to same hdf5 lib with netcdf4
+  - lz4
   - moto
   - netcdf4 !=1.7.4  # github.com/Unidata/netcdf4-python/issues/1464
   - pre-commit  # with ruff and mypy
@@ -22,7 +23,6 @@ dependencies:
   - pytest-html
   - pytest-rerunfailures
   - pytest-xdist
-  - python-lzf
   - s3fs >=2025.9.0
   # documentation dependencies
   - autodocsumm

pyfive/btree.py

@@ -1,6 +1,7 @@
 """HDF5 B-Trees and contents."""
 
 from collections import OrderedDict
+import lz4.frame as lzf
 import struct
 import zlib
 
@@ -186,12 +187,6 @@ def _filter_chunk(cls, chunk_buffer, filter_mask, filter_pipeline, itemsize):
                 # strip off 4-byte checksum from end of buffer
                 chunk_buffer = chunk_buffer[:-4]
             elif filter_id == LZF_FILTER:
-                try:
-                    import lzf
-                except ImportError as e:
-                    raise ModuleNotFoundError(
-                        "LZF codec requires optional package 'python-lzf'."
-                    ) from e
                 uncompressed_len = struct.unpack(">H", chunk_buffer[:2])[0]
                 chunk_buffer = lzf.decompress(chunk_buffer, uncompressed_len)
             else:

pyproject.toml

@@ -54,6 +54,7 @@ test = [
     "flask-cors",
     "h5netcdf",
     "h5py",
+    "lz4",
     "moto",
     "netCDF4!=1.7.4",  # github.com/Unidata/netcdf4-python/issues/1464
     "pre-commit",  # with ruff and mypy
@@ -62,7 +63,6 @@ test = [
     "pytest-html",
     "pytest-rerunfailures",
     "pytest-xdist",
-    "python-lzf",
     "s3fs>=2025.9.0",  # v-mismatch with boto3 results in ancient s3fs
 ]