style fixes per flake8

.flake8

@@ -0,0 +1,29 @@
+[flake8]
+ignore =
+    # E501 line too long
+    E501,
+    # W391 newlines at EOF
+    W391,
+    # E241 multiple spaces after comma
+    E241,
+    # E302 expected 2 newlines
+    E302,
+    # W503 line break before binary operator (to be deprecated)
+    W503,
+    # E265 block comment should start with '# '
+    E265,
+    # E123 closing bracket does not match indentation of opening bracket's line
+    E123,
+    # E124 closing bracket does not match visual indentation
+    E124,
+    # E221 multiple spaces before operator
+    E221,
+    # E201 whitespace after '['
+    E201,
+    # E741 ambiguous variable name 'I'
+    E741,
+
+
+per-file-ignores =
+    # F401 import without use
+    */__init__.py: F401,

opencl_fdtd/simulation.py

@@ -85,7 +85,7 @@ class Simulation(object):
                  queue: pyopencl.CommandQueue = None,
                  float_type: numpy.float32 or numpy.float64 = numpy.float32,
                  do_poynting: bool = True,
-                 do_poynting_halves = False,
+                 do_poynting_halves: bool = False,
                  do_fieldsrc: bool = False):
         """
         Initialize the simulation.
@@ -179,7 +179,7 @@ class Simulation(object):
         base_fields[ptr('E')] = self.E
         base_fields[ptr('H')] = self.H
         base_fields[ctype + ' dt'] = self.dt
-        if uniform_dx == False:
+        if uniform_dx is False:
             inv_dx_names = ['inv_d' + eh + r for eh in 'eh' for r in 'xyz']
             for name, field in zip(inv_dx_names, self.inv_dxes):
                 base_fields[ptr(name)] = field
@@ -227,7 +227,6 @@ class Simulation(object):
             self.sources['F'] = F_source
             self.sources['G'] = G_source
 
-
         S_fields = OrderedDict()
         if do_poynting:
             self.S = pyopencl.array.zeros_like(self.E)
@@ -238,7 +237,6 @@ class Simulation(object):
             S_fields[ptr('S0')] = self.S0
             S_fields[ptr('S1')] = self.S1
 
-
         J_fields = OrderedDict()
         if do_fieldsrc:
             J_source = jinja_env.get_template('update_j.cl').render(**jinja_args)
@@ -249,7 +247,6 @@ class Simulation(object):
             J_fields[ptr('Jr')] = self.Jr
             J_fields[ptr('Ji')] = self.Ji
 
-
         '''
         PML
         '''
@@ -273,9 +270,9 @@ class Simulation(object):
                                        arguments=', '.join(list(args.keys()) + var_args))
             self.update_J = lambda e, *a: update(*args.values(), *a, wait_for=e)
 
-
     def _create_pmls(self, pmls):
         ctype = type_to_C(self.arg_type)
+
         def ptr(arg: str) -> str:
             return ctype + ' *' + arg