remove unsed assignments, fix docstrings and format

mumps/mumps.py

@@ -508,8 +508,16 @@ class Context:
         else:
             return self._solve_dense(b, overwrite_b)
 
-    def get_schur(self, indices, a=None, ordering='auto', ooc=False,
-                  pivot_tol=0.01, overwrite_a=False, discard_factors=False):
+    def get_schur(
+        self,
+        indices,
+        a=None,
+        ordering="auto",
+        ooc=False,
+        pivot_tol=0.01,
+        overwrite_a=False,
+        discard_factors=False,
+    ):
         """Compute the Schur complement block of matrix a using MUMPS.
 
         Parameters:
@@ -551,8 +559,9 @@ class Context:
         if indices.ndim != 1:
             raise ValueError("Schur indices must be specified in a 1d array!")
         self.schur_indicies = indices = _makemumps_index_array(indices)
-        schur_compl = np.empty((indices.size, indices.size), order="C",
-                                    dtype=self.data.dtype)
+        schur_compl = np.empty(
+            (indices.size, indices.size), order="C", dtype=self.data.dtype
+        )
 
         self.mumps_instance.icntl[19] = 1
         self.mumps_instance.set_schur(schur_compl, indices)
@@ -611,8 +620,7 @@ class Context:
         """
         if self.schur_complement is None:
             raise RuntimeError(
-                "Factorization must be done by calling 'get_schur()' "
-                "before solving!"
+                "Factorization must be done by calling 'get_schur()' before solving!"
             )
 
         if b.shape[0] != self.n:
@@ -636,8 +644,7 @@ class Context:
             self.mumps_instance.icntl[20] = 1
 
         else:
-            dt, b = prepare_for_fortran(overwrite_b, b,
-                                        np.zeros(1, dtype=dtype))[:2]
+            dt, b = prepare_for_fortran(overwrite_b, b, np.zeros(1, dtype=dtype))[:2]
             self.mumps_instance.set_dense_rhs(b)
             x = b
 
@@ -650,14 +657,14 @@ class Context:
 
         self.mumps_instance.icntl[26] = 1  # Reduction/condensation phase
         self.mumps_instance.job = 3
-        t = self.call()
+        self.call()
 
         x2 = la.solve(self.schur_complement, schur_rhs)  # solve dense system
 
         schur_rhs[:] = x2
         self.mumps_instance.icntl[26] = 2  # Expansion phase
         self.mumps_instance.job = 3
-        t = self.call()
+        self.call()
 
         return x
 
@@ -709,9 +716,15 @@ def schur_complement(
         if ``calc_stats==True``.
     """
     with Context() as ctx:
-        schur_compl = ctx.get_schur(indices, a, ordering=ordering, ooc=ooc,
-                                    overwrite_a=overwrite_a,
-                                    pivot_tol=pivot_tol, discard_factors=True)
+        schur_compl = ctx.get_schur(
+            indices,
+            a,
+            ordering=ordering,
+            ooc=ooc,
+            overwrite_a=overwrite_a,
+            pivot_tol=pivot_tol,
+            discard_factors=True,
+        )
 
     if calc_stats:
         return [schur_compl, ctx.analysis_stats, ctx.factor_stats]