fix: update helper imports after format move

Author: pre-commit-ci[bot]

tests/test_cell_to_low_triangle.py

@@ -3,6 +3,7 @@
 import unittest
 
 import numpy as np
+
 from dpdata.formats.cp2k.cell import cell_to_low_triangle
 
 
@@ -45,16 +46,12 @@ def test_func3(self):
 
     def test_func4(self):
         with self.assertRaises(Exception) as c:
-            cell_to_low_triangle(
-                0.1, 6, 6, np.pi * 1 / 2, np.pi * 1 / 2, np.pi * 1 / 2
-            )
+            cell_to_low_triangle(0.1, 6, 6, np.pi * 1 / 2, np.pi * 1 / 2, np.pi * 1 / 2)
         self.assertTrue("A==0.1" in str(c.exception))
 
     def test_func5(self):
         with self.assertRaises(Exception) as c:
-            cell_to_low_triangle(
-                6, 6, 6, np.pi * 3 / 180, np.pi * 1 / 2, np.pi * 1 / 2
-            )
+            cell_to_low_triangle(6, 6, 6, np.pi * 3 / 180, np.pi * 1 / 2, np.pi * 1 / 2)
         self.assertTrue("alpha" in str(c.exception))
 
     def test_func6(self):

tests/test_gaussian_driver.py

@@ -8,6 +8,7 @@
 import numpy as np
 from comp_sys import CompSys, IsNoPBC
 from context import dpdata
+
 from dpdata.formats.gaussian.gjf import detect_multiplicity
 
 
@@ -84,9 +85,7 @@ def test_detect_multiplicity(self):
         self._check_multiplicity(["C", "H"], 2)
 
     def _check_multiplicity(self, symbols, multiplicity):
-        self.assertEqual(
-            detect_multiplicity(np.array(symbols)), multiplicity
-        )
+        self.assertEqual(detect_multiplicity(np.array(symbols)), multiplicity)
 
     def tearDown(self):
         if os.path.exists("gaussian/tmp.gjf"):

tests/test_qe_cp_traj.py

@@ -4,6 +4,7 @@
 
 import numpy as np
 from context import dpdata
+
 from dpdata.formats.qe.traj import convert_celldm
 
 bohr2ang = dpdata.unit.LengthConversion("bohr", "angstrom").value()