BUG: abstract types did not compare correctly with issubdtype

2 files changed, 11 insertions, 2 deletions

diff --git a/numpy/core/numerictypes.py b/numpy/core/numerictypes.py
index 136081412..e7e7e5509 100644
--- a/numpy/core/numerictypes.py
+++ b/numpy/core/numerictypes.py
@@ -751,14 +751,16 @@ def issubdtype(arg1, arg2):
     False
 
     """
+    if not issubclass_(arg1, generic):
+        arg1 = dtype(arg1).type
     if issubclass_(arg2, generic):
-        return issubclass(dtype(arg1).type, arg2)
+        return issubclass(arg1, arg2)
     mro = dtype(arg2).type.mro()
     if len(mro) > 1:
         val = mro[1]
     else:
         val = mro[0]
-    return issubclass(dtype(arg1).type, val)
+    return issubclass(arg1, val)
 
 
 # This dictionary allows look up based on any alias for an array data-type
diff --git a/numpy/core/tests/test_numerictypes.py b/numpy/core/tests/test_numerictypes.py
index f912e3944..977e4ce40 100644
--- a/numpy/core/tests/test_numerictypes.py
+++ b/numpy/core/tests/test_numerictypes.py
@@ -377,5 +377,12 @@ class TestMultipleFields(object):
         res = self.ary[['f0', 'f2']].tolist()
         assert_(res == [(1, 3), (5, 7)])
 
+
+class TestIsSubDType(object):
+    def test_both_abstract(self):
+        assert_(np.issubdtype(np.floating, np.inexact))
+        assert_(not np.issubdtype(np.inexact, np.floating))
+
+
 if __name__ == "__main__":
     run_module_suite()