MAINT: Remove implicit inheritance from object class (#15236)

Inheriting from object was necessary for Python 2 compatibility to use
new-style classes. In Python 3, this is unnecessary as there are no
old-style classes.

Dropping the object is more idiomatic Python.

4 files changed, 5 insertions, 5 deletions

diff --git a/numpy/testing/_private/noseclasses.py b/numpy/testing/_private/noseclasses.py
index 7cad24620..493bacfdd 100644
--- a/numpy/testing/_private/noseclasses.py
+++ b/numpy/testing/_private/noseclasses.py
@@ -266,7 +266,7 @@ class NumpyDoctest(npd.Doctest):
         return npd.Doctest.wantFile(self, file)
 
 
-class Unplugger(object):
+class Unplugger:
     """ Nose plugin to remove named plugin late in loading
 
     By default it removes the "doctest" plugin.
diff --git a/numpy/testing/_private/nosetester.py b/numpy/testing/_private/nosetester.py
index 6226eeb3c..a874321cc 100644
--- a/numpy/testing/_private/nosetester.py
+++ b/numpy/testing/_private/nosetester.py
@@ -110,7 +110,7 @@ def run_module_suite(file_to_run=None, argv=None):
     nose.run(argv=argv, addplugins=[KnownFailurePlugin()])
 
 
-class NoseTester(object):
+class NoseTester:
     """
     Nose test runner.
 
diff --git a/numpy/testing/_private/parameterized.py b/numpy/testing/_private/parameterized.py
index 2134cca88..dbfb4807c 100644
--- a/numpy/testing/_private/parameterized.py
+++ b/numpy/testing/_private/parameterized.py
@@ -293,10 +293,10 @@ def detect_runner():
             _test_runner_guess = None
     return _test_runner_guess
 
-class parameterized(object):
+class parameterized:
     """ Parameterize a test case::
 
-            class TestInt(object):
+            class TestInt:
                 @parameterized([
                     ("A", 10),
                     ("F", 15),
diff --git a/numpy/testing/_private/utils.py b/numpy/testing/_private/utils.py
index 1e118b538..9e5a2eb2a 100644
--- a/numpy/testing/_private/utils.py
+++ b/numpy/testing/_private/utils.py
@@ -2001,7 +2001,7 @@ class clear_and_catch_warnings(warnings.catch_warnings):
                 mod.__warningregistry__.update(self._warnreg_copies[mod])
 
 
-class suppress_warnings(object):
+class suppress_warnings:
     """
     Context manager and decorator doing much the same as
     ``warnings.catch_warnings``.