Don't use object as base class

datashader/bundling.py

@@ -185,7 +185,7 @@ def get_gradients(img):
     return (vert, horiz)
 
 
-class BaseSegment(object):
+class BaseSegment:
     @classmethod
     def create_delimiter(cls):
         return np.full((1, cls.ndims), np.nan)

datashader/core.py

@@ -32,7 +32,7 @@
 except Exception:
     spatialpandas = None
 
-class Axis(object):
+class Axis:
     """Interface for implementing axis transformations.
 
     Instances hold implementations of transformations to and from axis space.
@@ -150,7 +150,7 @@ def validate_xy_or_geometry(glyph, x, y, geometry):
 """.format(glyph=glyph, x=repr(x), y=repr(y), geometry=repr(geometry)))
 
 
-class Canvas(object):
+class Canvas:
     """An abstract canvas representing the space in which to bin.
 
     Parameters

datashader/datashape/coretypes.py

@@ -930,7 +930,7 @@ def _launder(x):
     return x
 
 
-class CollectionPrinter(object):
+class CollectionPrinter:
 
     def __repr__(self):
         s = str(self)

datashader/datashape/internal_utils.py

@@ -10,7 +10,7 @@
 import re
 
 
-class IndexCallable(object):
+class IndexCallable:
     """ Provide getitem syntax for functions
 
     >>> def inc(x):

datashader/datashape/parser.py

@@ -12,7 +12,7 @@
 __all__ = ['parse']
 
 
-class DataShapeParser(object):
+class DataShapeParser:
     """A DataShape parser object."""
     def __init__(self, ds_str, sym):
         # The datashape string being parsed

datashader/datashape/tests/test_coretypes.py

@@ -81,7 +81,7 @@ def test_error_on_datashape_with_string_argument():
         DataShape('5 * int32')
 
 
-class TestToNumpyDtype(object):
+class TestToNumpyDtype:
 
     def test_simple(self):
         assert to_numpy_dtype(dshape('2 * int32')) == np.int32
@@ -135,7 +135,7 @@ def test_timedelta_aliases():
                 dshape('timedelta[unit=%r]' % _unit_aliases[alias]))
 
 
-class TestFromNumPyDtype(object):
+class TestFromNumPyDtype:
 
     def test_int32(self):
         assert from_numpy((2,), 'int32') == dshape('2 * int32')
@@ -230,7 +230,7 @@ def test_option_passes_itemsize():
             dshape('float32').measure.itemsize)
 
 
-class TestComplexFieldNames(object):
+class TestComplexFieldNames:
 
     """
     The tests in this class should verify that the datashape parser can handle

datashader/datashape/tests/test_discovery.py

@@ -299,7 +299,7 @@ def test_letters_only_strings():
 
 
 def test_discover_array_like():
-    class MyArray(object):
+    class MyArray:
         def __init__(self, shape, dtype):
             self.shape = shape
             self.dtype = dtype
@@ -318,7 +318,7 @@ def test_discover_bytes():
 
 
 def test_discover_undiscoverable():
-    class MyClass(object):
+    class MyClass:
         pass
     with pytest.raises(NotImplementedError):
         discover(MyClass())

datashader/datashape/type_symbol_table.py

@@ -114,7 +114,7 @@ def _ellipsis(name):
 ]
 
 
-class TypeSymbolTable(object):
+class TypeSymbolTable:
 
     """
     This is a class which holds symbols for types and type constructors,

datashader/datashape/typesets.py

@@ -82,7 +82,7 @@ def matches_typeset(types, signature):
     return match
 
 
-class TypesetRegistry(object):
+class TypesetRegistry:
     def __init__(self):
         self.registry = {}
         self.lookup = self.registry.get

datashader/datatypes.py

@@ -82,7 +82,7 @@ def _validate_ragged_properties(start_indices, flat_array):
 # Internal ragged element array wrapper that provides
 # equality, ordering, and hashing.
 @total_ordering
-class _RaggedElement(object):
+class _RaggedElement:
 
     @staticmethod
     def ragged_or_nan(a):

datashader/glyphs/line.py

@@ -24,7 +24,7 @@
     spatialpandas = None
 
 
-class _AntiAliasedLine(object):
+class _AntiAliasedLine:
     """ Methods common to all lines. """
     _line_width = 0  # Use antialiasing if > 0.
 

datashader/pipeline.py

@@ -7,7 +7,7 @@
 from . import core
 
 
-class Pipeline(object):
+class Pipeline:
     """A datashading pipeline callback.
 
     Given a declarative specification, creates a callable with the following

datashader/tests/test_utils.py

@@ -12,7 +12,7 @@ def test_Dispatcher():
     foo.register(float, lambda a, b, c=1: a - b + c)
     foo.register(object, lambda a, b, c=1: 10)
 
-    class Bar(object):
+    class Bar:
         pass
     b = Bar()
     assert foo(1, 2) == 4

datashader/tiles.py

@@ -124,7 +124,7 @@ def invert_y_tile(y, z):
 
 
 # TODO: change name from source to definition
-class MercatorTileDefinition(object):
+class MercatorTileDefinition:
     ''' Implementation of mercator tile source
     In general, tile sources are used as a required input for ``TileRenderer``.
 
@@ -277,7 +277,7 @@ def get_tile_meters(self, tx, ty, level):
         return (xmin, ymin, xmax, ymax)
 
 
-class TileRenderer(object):
+class TileRenderer:
 
     def __init__(self, tile_definition, output_location, tile_format='PNG',
                  post_render_func=None):

datashader/transfer_functions/__init__.py

@@ -62,7 +62,7 @@ def _repr_html_(self):
 
 
 
-class Images(object):
+class Images:
     """
     A list of HTML-representable objects to display in a table.
     Primarily intended for Image objects, but could be anything

datashader/utils.py

@@ -49,7 +49,7 @@ class VisibleDeprecationWarning(UserWarning):
                             nb.__version__).groups()])
 
 
-class Expr(object):
+class Expr:
     """Base class for expression-like objects.
 
     Implements hashing and equality checks. Subclasses should implement an
@@ -83,7 +83,7 @@ def _hashable_inputs(self):
         return tuple(result)
 
 
-class Dispatcher(object):
+class Dispatcher:
     """Simple single dispatch."""
     def __init__(self):
         self._lookup = {}

examples/filetimes.py

@@ -33,7 +33,7 @@
 DD_FORCE_LOAD = False
 DASK_CLIENT = None
 
-class Parameters(object):
+class Parameters:
     base,x,y='data','x','y'
     dftype='pandas'
     categories=[]