Builder fixes

Address issues related to interfacing with kwant, such as qt/kwant-scf#10 and qt/kwant-scf#9.

meanfi/tests/test_kwant.py

@@ -51,7 +51,6 @@ def test_kwant_supercell(seed):
     """Test with Kwant supercell and callable onsite and hoppings."""
     np.random.seed(seed)
     ndim = np.random.randint(1, 3)
-    cutoff = np.random.randint(1, 3)
     sites_in_cell = np.random.randint(1, 4)
     ndof_per_site = [np.random.randint(1, 4) for site in range(sites_in_cell)]
     n_cells = np.random.randint(1, 4)
@@ -108,20 +107,16 @@ def test_kwant_supercell(seed):
         site1, site2 = site_pair[0]
         if site1 == site2:
             assert np.isclose(
-                random_builder[site1](
-                    site=site1, alpha=params["alpha"], beta=params["beta"]
-                ),
+                random_builder[site1](site=site1, alpha=params["alpha"], beta=params["beta"]),
                 random_builder_test[site1],
             ).all()
         else:
             try:
                 assert np.isclose(
-                    random_builder[site1, site2](
-                        site1, site2, gamma=params["gamma"], delta=params["delta"]
-                    ),
+                    random_builder[site1, site2](site1, site2, gamma=params["gamma"], delta=params["delta"]),
                     random_builder_test[site1, site2],
                 ).all()
             except KeyError:
                 continue
             except:
-                raise
+                raise
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