diff --git a/tests/run_tests.py b/tests/run_tests.py
index b10225f7fa..30d330e5d5 100755
--- a/tests/run_tests.py
+++ b/tests/run_tests.py
@@ -87,11 +87,11 @@ if len(sys.argv) > 1:
         if i == 'all-tests':
             tests__ = tests
             try:
-                idx = tests_.index('compile') # check for compile test
+                idx = tests_.index('compile')  # check for compile test
             except ValueError:
                 del tests__[0]
             finally:
-                break # don't need to check for anything else
+                break  # don't need to check for anything else
 
         # This checks for any subsets of tests. The string after
         # all-XXXX will be used to search through all tests.
@@ -109,7 +109,7 @@ if len(sys.argv) > 1:
                     if j.rfind(suffix) != -1:
                         tests__.append(j)
         else:
-            tests__.append(i) # append specific test (e.g., mpi-debug)
+            tests__.append(i)  # append specific test (e.g., mpi-debug)
     tests = tests__ if tests__ else tests
 
 # Run tests
diff --git a/tests/test_compile/test_compile.py b/tests/test_compile/test_compile.py
index bc3b2391d6..997f243d7b 100644
--- a/tests/test_compile/test_compile.py
+++ b/tests/test_compile/test_compile.py
@@ -59,18 +59,21 @@ def test_mpi():
     assert returncode == 0
     shutil.move('openmc', 'openmc-mpi')
 
+
 def test_mpi_debug():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'DEBUG=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-mpi-debug')
 
+
 def test_mpi_optimize():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'OPTIMIZE=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-mpi-optimize')
 
+
 def test_omp():
     returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'OPENMP=yes'])
@@ -84,36 +87,43 @@ def test_hdf5():
     assert returncode == 0
     shutil.move('openmc', 'openmc-hdf5')
 
+
 def test_hdf5_debug():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'HDF5=yes', 'DEBUG=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-hdf5-debug')
 
+
 def test_hdf5_optimize():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'HDF5=yes', 'OPTIMIZE=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-hdf5-optimize')
 
+
 def test_petsc():
     returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'PETSC=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-petsc')
 
+
 def test_petsc_debug():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'PETSC=yes', 'DEBUG=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-petsc-debug')
 
+
 def test_petsc_optimize():
-    returncode = run(['make','distclean'])
-    returncode = run(['make', compiler, 'MPI=yes', 'PETSC=yes', 'OPTIMIZE=yes'])
+    returncode = run(['make', 'distclean'])
+    returncode = run(['make', compiler, 'MPI=yes', 'PETSC=yes',
+                      'OPTIMIZE=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-petsc-optimize')
 
+
 def test_mpi_omp():
     returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'OPENMP=yes'])
@@ -127,36 +137,43 @@ def test_omp_hdf5():
     assert returncode == 0
     shutil.move('openmc', 'openmc-omp-hdf5')
 
+
 def test_mpi_hdf5():
     returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-phdf5')
 
+
 def test_mpi_hdf5_debug():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes', 'DEBUG=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-phdf5-debug')
 
+
 def test_mpi_hdf5_optimize():
-    returncode = run(['make','distclean'])
+    returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes', 'OPTIMIZE=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-phdf5-optimize')
 
+
 def test_mpi_hdf5_petsc():
     returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes', 'PETSC=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-phdf5-petsc')
 
+
 def test_mpi_hdf5_petsc_debug():
-    returncode = run(['make','distclean'])
-    returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes', 'PETSC=yes', 'DEBUG=yes'])
+    returncode = run(['make', 'distclean'])
+    returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes', 'PETSC=yes',
+                      'DEBUG=yes'])
     assert returncode == 0
     shutil.move('openmc', 'openmc-phdf5-petsc-debug')
 
+
 def test_mpi_hdf5_petsc_optimize():
     returncode = run(['make', 'distclean'])
     returncode = run(['make', compiler, 'MPI=yes', 'HDF5=yes', 'PETSC=yes',