diff --git a/phono3py/conductivity/direct_solution.py b/phono3py/conductivity/direct_solution.py
index 89b31ceb..0b292431 100644
--- a/phono3py/conductivity/direct_solution.py
+++ b/phono3py/conductivity/direct_solution.py
@@ -519,9 +519,9 @@ def _set_collision_matrix_at_sigmas(self, i_gp):
                 else:
                     i_data = 0
                 self._gamma[j, k, i_data] = self._collision.imag_self_energy
-                self._collision_matrix[
-                    j, k, i_data
-                ] = self._collision.get_collision_matrix()
+                self._collision_matrix[j, k, i_data] = (
+                    self._collision.get_collision_matrix()
+                )
 
     def _prepare_collision_matrix(self):
         """Collect pieces and construct collision matrix."""
diff --git a/phono3py/conductivity/rta.py b/phono3py/conductivity/rta.py
index f9f9e346..44a786e8 100644
--- a/phono3py/conductivity/rta.py
+++ b/phono3py/conductivity/rta.py
@@ -298,9 +298,9 @@ def _set_gamma_at_sigmas(self, i):
                     self._gamma_N[j, k, i] = g_N
                     self._gamma_U[j, k, i] = g_U
                 if self._is_gamma_detail:
-                    self._gamma_detail_at_q[
-                        k
-                    ] = self._collision.get_detailed_imag_self_energy()
+                    self._gamma_detail_at_q[k] = (
+                        self._collision.get_detailed_imag_self_energy()
+                    )
 
     def _set_gamma_at_sigmas_lowmem(self, i):
         """Calculate gamma without storing ph-ph interaction strength.
diff --git a/phono3py/interface/calculator.py b/phono3py/interface/calculator.py
index 15f0014d..e0b52d51 100644
--- a/phono3py/interface/calculator.py
+++ b/phono3py/interface/calculator.py
@@ -34,7 +34,6 @@
 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
-
 calculator_info = {
     "abinit": {"option": {"name": "--abinit", "help": "Invoke Abinit mode"}},
     # 'aims': {'option': {'name': "--aims",
diff --git a/phono3py/phonon3/real_self_energy.py b/phono3py/phonon3/real_self_energy.py
index b39bc039..c2c8d95b 100644
--- a/phono3py/phonon3/real_self_energy.py
+++ b/phono3py/phonon3/real_self_energy.py
@@ -292,16 +292,16 @@ def _run_py_with_frequency_points(self):
                 freqs = self._frequencies[triplet]
                 for j, _ in enumerate(self._band_indices):
                     if self._temperature > 0:
-                        self._real_self_energies[
-                            k, j
-                        ] += self._real_self_energies_at_bands(
-                            j, fpoint, freqs, interaction, w
+                        self._real_self_energies[k, j] += (
+                            self._real_self_energies_at_bands(
+                                j, fpoint, freqs, interaction, w
+                            )
                         )
                     else:
-                        self._real_self_energies[
-                            k, j
-                        ] += self._real_self_energies_at_bands_0K(
-                            j, fpoint, freqs, interaction, w
+                        self._real_self_energies[k, j] += (
+                            self._real_self_energies_at_bands_0K(
+                                j, fpoint, freqs, interaction, w
+                            )
                         )
 
         self._real_self_energies *= self._unit_conversion