REF: import matplotlib in each test where required

Author: ivanovmg

pandas/tests/plotting/test_style.py

@@ -1,5 +1,4 @@
 from cycler import cycler
-import matplotlib as mpl
 import matplotlib.colors
 import pytest
 
@@ -20,6 +19,8 @@ class TestGetStandardColors:
         ],
     )
     def test_default_colors_named_from_prop_cycle(self, num_colors, expected):
+        import matplotlib as mpl
+
         mpl_params = {
             "axes.prop_cycle": cycler(color=["red", "green", "blue"]),
         }
@@ -38,6 +39,8 @@ def test_default_colors_named_from_prop_cycle(self, num_colors, expected):
         ],
     )
     def test_default_colors_named_from_prop_cycle_string(self, num_colors, expected):
+        import matplotlib as mpl
+
         mpl_params = {
             "axes.prop_cycle": cycler(color="bgry"),
         }
@@ -70,6 +73,8 @@ def test_default_colors_named_from_prop_cycle_string(self, num_colors, expected)
         ],
     )
     def test_default_colors_named_undefined_prop_cycle(self, num_colors, expected_name):
+        import matplotlib as mpl
+
         with mpl.rc_context(rc={}):
             expected = [matplotlib.colors.to_hex(x) for x in expected_name]
             result = get_standard_colors(num_colors=num_colors)