refactor!: remove load_json

This function was required by `batch_clean`, which is no longer
necessary due to new storing scheme.

docs/source/changes.rst

@@ -13,7 +13,8 @@ Version 0.2.0
 
    * :mod:`moxel.visualize` since PyVista already provides a simple way to
      visualize voxels (:issue:`9`).
-   * :mod:`moxel.utils.batch_clean` since it is no longer necessary to "clean"
+   * :func:`~moxel.utils.load_json` which was needed by :func:`~moxel.utils.batch_clean`.
+   * :func:`~moxel.utils.batch_clean` since it is no longer necessary to "clean"
      voxels due to new storing scheme.
 
 Version 0.1.2

src/moxel/utils.py

@@ -36,7 +36,6 @@
 """
 
 import os
-import json
 import itertools
 from pathlib import Path
 from multiprocessing import Pool
@@ -48,25 +47,6 @@
 warnings.filterwarnings('ignore')
 
 
-def load_json(fname):
-    r"""
-    Load a ``.json`` file.
-
-    Parameters
-    ----------
-    fname : str
-        Pathname to the ``.json`` file.
-
-    Returns
-    -------
-    names : list
-    """
-    with open(fname, 'r') as fhand:
-        data = json.load(fhand)
-
-    return data
-
-
 def mic_scale_factors(r, lattice_vectors):
     r"""
     Return scale factors to satisfy minimum image convention [MIC]_.
@@ -186,7 +166,7 @@ def calculate(self, cubic_box=False, length=30, potential='lj', n_jobs=None):
             probe_coords = np.linspace(0, 1, self.grid_size)  # Fractional.
             scale = mic_scale_factors(self.cutoff, self.structure.lattice.matrix)
             self._simulation_box = self.structure * scale
-        
+
         if potential == 'lj':
             # Cache LJ parameters for all atoms in the simulation box.
             self._lj_params = np.array(

tests/test_utils.py

@@ -15,14 +15,15 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 import os
-import sys
-import json
 import unittest
 import tempfile
 from pathlib import Path
 import numpy as np
 from pymatgen.core import Structure
-from moxel.utils import *
+from moxel.utils import (
+        Grid, mic_scale_factors, voxels_from_file,
+        voxels_from_files, voxels_from_dir
+        )
 
 
 class TestUtils(unittest.TestCase):