MAINT: Do not emit empty Methods heading in np.info (#17498)

Fixes the incompatible type comparison found in #17490.

This also corrects the logic to not print the heading when only private/magic methods are present.

1 files changed, 19 insertions, 0 deletions

diff --git a/numpy/lib/tests/test_utils.py b/numpy/lib/tests/test_utils.py
index 261cfef5d..33951b92a 100644
--- a/numpy/lib/tests/test_utils.py
+++ b/numpy/lib/tests/test_utils.py
@@ -140,3 +140,22 @@ class TestByteBounds:
 def test_assert_raises_regex_context_manager():
     with assert_raises_regex(ValueError, 'no deprecation warning'):
         raise ValueError('no deprecation warning')
+
+
+def test_info_method_heading():
+    # info(class) should only print "Methods:" heading if methods exist
+
+    class NoPublicMethods:
+        pass
+
+    class WithPublicMethods:
+        def first_method():
+            pass
+            
+    def _has_method_heading(cls):
+        out = StringIO()
+        utils.info(cls, output=out)
+        return 'Methods:' in out.getvalue()
+
+    assert _has_method_heading(WithPublicMethods)
+    assert not _has_method_heading(NoPublicMethods)