fix flake8 complaints

src/cobra/flux_analysis/loopless.py

@@ -162,9 +162,9 @@ def loopless_solution(
     - All fluxes have the same sign (flow in the same direction) as the
       previous solution.
 
-    When providing fluxes to the method, please note that those have to come from the exact same model
-    that you provided, meaning that no bounds or coefficients have been changed, and the
-    optimum has remained the same.
+    When providing fluxes to the method, please note that those have to come from the
+    exact same model that you provided, meaning that no bounds or coefficients have
+    been changed, and the optimum has remained the same.
 
     References
     ----------

tests/test_core/test_core_reaction.py

@@ -1036,7 +1036,7 @@ def test_compartment_changes(model: Model) -> None:
 def test_gpr_serialization(model: Model) -> None:
     """Verify that reactions GPRs are serialized compactly as str."""
     state = model.reactions[0].__getstate__()
-    assert type(state["_gpr"]) == str
+    assert isinstance(state["_gpr"],  str)
 
 
 def test_gpr_serialization_backwards_compatibility(model: Model) -> None: