diff --git a/opencl_fdfd/csr.py b/opencl_fdfd/csr.py
index ec49c09..b84eec0 100644
--- a/opencl_fdfd/csr.py
+++ b/opencl_fdfd/csr.py
@@ -31,7 +31,6 @@ from . import ops
 if TYPE_CHECKING:
     import scipy
 
-__author__ = 'Jan Petykiewicz'
 
 logger = logging.getLogger(__name__)
 
@@ -99,18 +98,18 @@ def cg(
 
     m = CSRMatrix(queue, A)
 
-    '''
-    Generate OpenCL kernels
-    '''
+    #
+    # Generate OpenCL kernels
+    #
     a_step = ops.create_a_csr(context)
     xr_step = ops.create_xr_step(context)
     rhoerr_step = ops.create_rhoerr_step(context)
     p_step = ops.create_p_step(context)
     dot = ops.create_dot(context)
 
-    '''
-    Start the solve
-    '''
+    #
+    # Start the solve
+    #
     start_time2 = time.perf_counter()
 
     _, err2 = rhoerr_step(r, [])
@@ -140,9 +139,9 @@ def cg(
         if k % 1000 == 0:
             logger.info(f'iteration {k}')
 
-    '''
-    Done solving
-    '''
+    #
+    # Done solving
+    #
     time_elapsed = time.perf_counter() - start_time
 
     x = x.get()
diff --git a/opencl_fdfd/main.py b/opencl_fdfd/main.py
index 769aee3..9e57395 100644
--- a/opencl_fdfd/main.py
+++ b/opencl_fdfd/main.py
@@ -20,8 +20,6 @@ import meanas.fdfd.operators
 from . import ops
 
 
-__author__ = 'Jan Petykiewicz'
-
 logger = logging.getLogger(__name__)
 
 
@@ -113,9 +111,9 @@ def cg_solver(
     L, R = meanas.fdfd.operators.e_full_preconditioners(dxes)
     b_preconditioned = (R if adjoint else L) @ b
 
-    '''
-        Allocate GPU memory and load in data
-    '''
+    #
+    # Allocate GPU memory and load in data
+    #
     if context is None:
         context = pyopencl.create_some_context(interactive=True)
 
@@ -155,10 +153,10 @@ def cg_solver(
     else:
         gpmc = load_field(numpy.asarray(pmc, dtype=bool), dtype=numpy.int8)
 
-    '''
-    Generate OpenCL kernels
-    '''
-    has_mu, has_pec, has_pmc = [q is not None for q in (mu, pec, pmc)]
+    #
+    # Generate OpenCL kernels
+    #
+    has_mu, has_pec, has_pmc = (qq is not None for qq in (mu, pec, pmc))
 
     a_step_full = ops.create_a(context, shape, has_mu, has_pec, has_pmc)
     xr_step = ops.create_xr_step(context)
@@ -174,9 +172,9 @@ def cg_solver(
             ) -> list[pyopencl.Event]:
         return a_step_full(E, H, p, inv_dxes, oeps, invm, gpec, gpmc, Pl, Pr, events)
 
-    '''
-    Start the solve
-    '''
+    #
+    # Start the solve
+    #
     start_time2 = time.perf_counter()
 
     _, err2 = rhoerr_step(r, [])
@@ -209,16 +207,13 @@ def cg_solver(
         if k % 1000 == 0:
             logger.info(f'iteration {k}')
 
-    '''
-    Done solving
-    '''
+    #
+    # Done solving
+    #
     time_elapsed = time.perf_counter() - start_time
 
     # Undo preconditioners
-    if adjoint:
-        x = (Pl * x).get()
-    else:
-        x = (Pr * x).get()
+    x = ((Pl if adjoint else Pr) * x).get()
 
     if success:
         logger.info('Solve success')
diff --git a/opencl_fdfd/ops.py b/opencl_fdfd/ops.py
index 80bf836..c2d73ed 100644
--- a/opencl_fdfd/ops.py
+++ b/opencl_fdfd/ops.py
@@ -56,6 +56,7 @@ def type_to_C(
 
     return types[float_type]
 
+
 # Type names
 ctype = type_to_C(numpy.complex128)
 ctype_bare = 'cdouble'
@@ -123,9 +124,9 @@ def create_a(
     des = [ctype + ' *inv_de' + a for a in 'xyz']
     dhs = [ctype + ' *inv_dh' + a for a in 'xyz']
 
-    '''
-    Convert p to initial E (ie, apply right preconditioner and PEC)
-    '''
+    #
+    # Convert p to initial E (ie, apply right preconditioner and PEC)
+    #
     p2e_source = jinja_env.get_template('p2e.cl').render(pec=pec)
     P2E_kernel = ElementwiseKernel(
         context,
@@ -135,9 +136,9 @@ def create_a(
         arguments=', '.join(ptrs('E', 'p', 'Pr') + pec_arg),
         )
 
-    '''
-    Calculate intermediate H from intermediate E
-    '''
+    #
+    # Calculate intermediate H from intermediate E
+    #
     e2h_source = jinja_env.get_template('e2h.cl').render(
         mu=mu,
         pmc=pmc,
@@ -151,9 +152,9 @@ def create_a(
         arguments=', '.join(ptrs('E', 'H', 'inv_mu') + pmc_arg + des),
         )
 
-    '''
-    Calculate final E (including left preconditioner)
-    '''
+    #
+    # Calculate final E (including left preconditioner)
+    #
     h2e_source = jinja_env.get_template('h2e.cl').render(
         pec=pec,
         common_cl=common_source,
@@ -277,7 +278,7 @@ def create_rhoerr_step(context: pyopencl.Context) -> Callable[..., tuple[complex
 
     def ri_update(r: pyopencl.array.Array, e: list[pyopencl.Event]) -> tuple[complex, complex]:
         g = ri_kernel(r, wait_for=e).astype(ri_dtype).get()
-        rr, ri, ii = [g[q] for q in 'xyz']
+        rr, ri, ii = (g[qq] for qq in 'xyz')
         rho = rr + 2j * ri - ii
         err = rr + ii
         return rho, err