sets used instead of lists when membership testing (#3021)

openmc/arithmetic.py

@@ -10,10 +10,10 @@ from .filter import _FILTER_TYPES
 
 
 # Acceptable tally arithmetic binary operations
-_TALLY_ARITHMETIC_OPS = ['+', '-', '*', '/', '^']
+_TALLY_ARITHMETIC_OPS = {'+', '-', '*', '/', '^'}
 
 # Acceptable tally aggregation operations
-_TALLY_AGGREGATE_OPS = ['sum', 'avg']
+_TALLY_AGGREGATE_OPS = {'sum', 'avg'}
 
 
 class CrossScore:

openmc/data/photon.py

@@ -28,10 +28,10 @@ CM_PER_ANGSTROM = 1.0e-8
 R0 = CM_PER_ANGSTROM * PLANCK_C / (2.0 * pi * FINE_STRUCTURE * MASS_ELECTRON_EV)
 
 # Electron subshell labels
-_SUBSHELLS = [None, 'K', 'L1', 'L2', 'L3', 'M1', 'M2', 'M3', 'M4', 'M5',
+_SUBSHELLS = (None, 'K', 'L1', 'L2', 'L3', 'M1', 'M2', 'M3', 'M4', 'M5',
               'N1', 'N2', 'N3', 'N4', 'N5', 'N6', 'N7', 'O1', 'O2', 'O3',
               'O4', 'O5', 'O6', 'O7', 'O8', 'O9', 'P1', 'P2', 'P3', 'P4',
-              'P5', 'P6', 'P7', 'P8', 'P9', 'P10', 'P11', 'Q1', 'Q2', 'Q3']
+              'P5', 'P6', 'P7', 'P8', 'P9', 'P10', 'P11', 'Q1', 'Q2', 'Q3')
 
 _REACTION_NAME = {
     501: ('Total photon interaction', 'total'),

openmc/mgxs_library.py

@@ -18,21 +18,17 @@ ROOM_TEMPERATURE_KELVIN = 294.0
 # Supported incoming particle MGXS angular treatment representations
 REPRESENTATION_ISOTROPIC = 'isotropic'
 REPRESENTATION_ANGLE = 'angle'
-_REPRESENTATIONS = [
+_REPRESENTATIONS = {
     REPRESENTATION_ISOTROPIC,
     REPRESENTATION_ANGLE
-]
+}
 
 # Supported scattering angular distribution representations
-_SCATTER_TYPES = [
+_SCATTER_TYPES = {
     SCATTER_TABULAR,
     SCATTER_LEGENDRE,
     SCATTER_HISTOGRAM
-]
-
-# List of MGXS indexing schemes
-_XS_SHAPES = ["[G][G'][Order]", "[G]", "[G']", "[G][G']", "[DG]", "[DG][G]",
-              "[DG][G']", "[DG][G][G']"]
+}
 
 # Number of mu points for conversion between scattering formats
 _NMU = 257

openmc/plots.py

@@ -14,7 +14,7 @@ from openmc.checkvalue import PathLike
 from ._xml import clean_indentation, get_elem_tuple, reorder_attributes, get_text
 from .mixin import IDManagerMixin
 
-_BASES = ['xy', 'xz', 'yz']
+_BASES = {'xy', 'xz', 'yz'}
 
 _SVG_COLORS = {
     'aliceblue': (240, 248, 255),

openmc/plotter.py

@@ -7,15 +7,15 @@ import openmc.checkvalue as cv
 import openmc.data
 
 # Supported keywords for continuous-energy cross section plotting
-PLOT_TYPES = ['total', 'scatter', 'elastic', 'inelastic', 'fission',
+PLOT_TYPES = {'total', 'scatter', 'elastic', 'inelastic', 'fission',
               'absorption', 'capture', 'nu-fission', 'nu-scatter', 'unity',
-              'slowing-down power', 'damage']
+              'slowing-down power', 'damage'}
 
 # Supported keywords for multi-group cross section plotting
-PLOT_TYPES_MGXS = ['total', 'absorption', 'scatter', 'fission',
+PLOT_TYPES_MGXS = {'total', 'absorption', 'scatter', 'fission',
                    'kappa-fission', 'nu-fission', 'prompt-nu-fission',
                    'deleyed-nu-fission', 'chi', 'chi-prompt', 'chi-delayed',
-                   'inverse-velocity', 'beta', 'decay-rate', 'unity']
+                   'inverse-velocity', 'beta', 'decay-rate', 'unity'}
 # Create a dictionary which can be used to convert PLOT_TYPES_MGXS to the
 # openmc.XSdata attribute name needed to access the data
 _PLOT_MGXS_ATTR = {line: line.replace(' ', '_').replace('-', '_')

openmc/search.py

@@ -8,7 +8,7 @@ import openmc.model
 import openmc.checkvalue as cv
 
 
-_SCALAR_BRACKETED_METHODS = ['brentq', 'brenth', 'ridder', 'bisect']
+_SCALAR_BRACKETED_METHODS = {'brentq', 'brenth', 'ridder', 'bisect'}
 
 
 def _search_keff(guess, target, model_builder, model_args, print_iterations,

openmc/settings.py

@@ -26,7 +26,7 @@ class RunMode(Enum):
     PARTICLE_RESTART = 'particle restart'
 
 
-_RES_SCAT_METHODS = ['dbrc', 'rvs']
+_RES_SCAT_METHODS = {'dbrc', 'rvs'}
 
 
 class Settings:

openmc/stats/univariate.py

@@ -16,13 +16,13 @@ import openmc.checkvalue as cv
 from .._xml import get_text
 from ..mixin import EqualityMixin
 
-_INTERPOLATION_SCHEMES = [
+_INTERPOLATION_SCHEMES = {
     'histogram',
     'linear-linear',
     'linear-log',
     'log-linear',
     'log-log'
-]
+}
 
 
 class Univariate(EqualityMixin, ABC):

openmc/surface.py

@@ -14,8 +14,8 @@ from .region import Region, Intersection, Union
 from .bounding_box import BoundingBox
 
 
-_BOUNDARY_TYPES = ['transmission', 'vacuum', 'reflective', 'periodic', 'white']
-_ALBEDO_BOUNDARIES = ['reflective', 'periodic', 'white']
+_BOUNDARY_TYPES = {'transmission', 'vacuum', 'reflective', 'periodic', 'white'}
+_ALBEDO_BOUNDARIES = {'reflective', 'periodic', 'white'}
 
 _WARNING_UPPER = """\
 "{}(...) accepts an argument named '{}', not '{}'. Future versions of OpenMC \