Remove distutils usage in plot.py since it's not available in Python 3.12

Author: marcharper

axelrod/plot.py

@@ -1,5 +1,4 @@
 import pathlib
-from distutils.version import LooseVersion
 from typing import List, Union
 
 import matplotlib
@@ -16,13 +15,6 @@
 dataType = List[List[Union[int, float]]]
 
 
-def default_cmap(version: str = "2.0") -> str:
-    """Sets a default matplotlib colormap based on the version."""
-    if LooseVersion(version) >= "1.5":
-        return "viridis"
-    return "YlGnBu"
-
-
 class Plot(object):
     def __init__(self, result_set: ResultSet) -> None:
         self.result_set = result_set
@@ -184,6 +176,7 @@ def _payoff_heatmap(
         names: namesType,
         title: titleType = None,
         ax: matplotlib.axes.SubplotBase = None,
+        cmap: str = 'viridis'
     ) -> matplotlib.figure.Figure:
         """Generic heatmap plot"""
 
@@ -196,8 +189,6 @@ def _payoff_heatmap(
         width = max(self.num_players / 4, 12)
         height = width
         figure.set_size_inches(width, height)
-        matplotlib_version = matplotlib.__version__
-        cmap = default_cmap(matplotlib_version)
         mat = ax.matshow(data, cmap=cmap)
         ax.set_xticks(range(self.result_set.num_players))
         ax.set_yticks(range(self.result_set.num_players))

axelrod/tests/unit/test_plot.py

@@ -75,34 +75,6 @@ def setUpClass(cls):
             ["Defector", "Tit For Tat", "Alternator"],
         )
 
-    def test_default_cmap(self):
-        cmap = axl.plot.default_cmap("0.0")
-        self.assertEqual(cmap, "YlGnBu")
-
-        cmap = axl.plot.default_cmap("1.3alpha")
-        self.assertEqual(cmap, "YlGnBu")
-
-        cmap = axl.plot.default_cmap("1.4.99")
-        self.assertEqual(cmap, "YlGnBu")
-
-        cmap = axl.plot.default_cmap("1.4")
-        self.assertEqual(cmap, "YlGnBu")
-
-        cmap = axl.plot.default_cmap()
-        self.assertEqual(cmap, "viridis")
-
-        cmap = axl.plot.default_cmap("1.5")
-        self.assertEqual(cmap, "viridis")
-
-        cmap = axl.plot.default_cmap("1.5beta")
-        self.assertEqual(cmap, "viridis")
-
-        cmap = axl.plot.default_cmap("1.7")
-        self.assertEqual(cmap, "viridis")
-
-        cmap = axl.plot.default_cmap("2.0")
-        self.assertEqual(cmap, "viridis")
-
     def test_init(self):
         plot = axl.Plot(self.test_result_set)
         self.assertEqual(plot.result_set, self.test_result_set)