diff --git a/meanas/fdfd/functional.py b/meanas/fdfd/functional.py
index 326f38b..bd31192 100644
--- a/meanas/fdfd/functional.py
+++ b/meanas/fdfd/functional.py
@@ -219,4 +219,3 @@ def poynting_e_cross_h(dxes: dx_lists_t):
         s[2] = numpy.roll(ex, -1, axis=2) * hy - numpy.roll(ey, -1, axis=2) * hx
         return s
     return exh
-
diff --git a/meanas/fdfd/waveguide.py b/meanas/fdfd/waveguide.py
index 14e3502..c24a471 100644
--- a/meanas/fdfd/waveguide.py
+++ b/meanas/fdfd/waveguide.py
@@ -32,10 +32,10 @@ __author__ = 'Jan Petykiewicz'
 
 
 def operator_e(omega: complex,
-             dxes: dx_lists_t,
-             epsilon: vfield_t,
-             mu: vfield_t = None,
-             ) -> sparse.spmatrix:
+               dxes: dx_lists_t,
+               epsilon: vfield_t,
+               mu: vfield_t = None,
+               ) -> sparse.spmatrix:
     if numpy.any(numpy.equal(mu, None)):
         mu = numpy.ones_like(epsilon)
 
diff --git a/meanas/fdtd/boundaries.py b/meanas/fdtd/boundaries.py
index 34a8d4a..cba1797 100644
--- a/meanas/fdtd/boundaries.py
+++ b/meanas/fdtd/boundaries.py
@@ -37,7 +37,7 @@ def conducting_boundary(direction: int,
 
         return en, hn
 
-    elif polarity > 0:
+    if polarity > 0:
         boundary_slice = [slice(None)] * 3
         shifted1_slice = [slice(None)] * 3
         shifted2_slice = [slice(None)] * 3
@@ -62,7 +62,4 @@ def conducting_boundary(direction: int,
 
         return ep, hp
 
-    else:
-        raise Exception('Bad polarity: {}'.format(polarity))
-
-
+    raise Exception('Bad polarity: {}'.format(polarity))
diff --git a/meanas/fdtd/pml.py b/meanas/fdtd/pml.py
index 3e10aa6..7d73e38 100644
--- a/meanas/fdtd/pml.py
+++ b/meanas/fdtd/pml.py
@@ -13,7 +13,7 @@ from .. import dx_lists_t, field_t, field_updater
 __author__ = 'Jan Petykiewicz'
 
 
-def cpml(direction:int,
+def cpml(direction: int,
          polarity: int,
          dt: float,
          epsilon: field_t,