Fix formating of files

Author: JanLuca

varipeps/contractions/apply.py

@@ -121,7 +121,10 @@ class definition for details.
             if f == "tensor":
                 tensors.append(peps_tensors[ti])
             elif f == "tensor_conj":
-                if hasattr(peps_tensor_objs[ti], "tensor_conj") and peps_tensor_objs[ti].tensor_conj is not None:
+                if (
+                    hasattr(peps_tensor_objs[ti], "tensor_conj")
+                    and peps_tensor_objs[ti].tensor_conj is not None
+                ):
                     tensors.append(peps_tensor_objs[ti].tensor_conj)
                 else:
                     tensors.append(peps_tensors[ti].conj())