matplotlib
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‎lib/matplotlib/tests/test_coding_standards.py‎
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‎lib/matplotlib/tests/test_coding_standards.py‎
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‎lib/matplotlib/tests/test_patheffects.py‎
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‎lib/matplotlib/tests/test_patheffects.py‎
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@@ -152,7 +152,7 @@ def assert_pep8_conformance(module=matplotlib, exclude_files=None,
             raise ValueError('Some exclude patterns were unnecessary as the '
                              'files they pointed to either passed the PEP8 '
                              'tests or do not point to a file:\n  '
-                             '{}'.format('\n  '.join(unexpectedly_good)))
+                             '{0}'.format('\n  '.join(unexpectedly_good)))
 
 
 def test_pep8_conformance_installed_files():
 
@@ -97,7 +97,7 @@ def test_PathEffect_points_to_pixels():
 
     assert isinstance(pe_renderer, path_effects.PathEffectRenderer), (
                 'Expected a PathEffectRendere instance, got '
-                'a {} instance.'.format(type(pe_renderer)))
+                'a {0} instance.'.format(type(pe_renderer)))
 
     # Confirm that using a path effects renderer maintains point sizes
     # appropriately. Otherwise rendered font would be the wrong size.