DEP: polynomial: Be stricter about integral arguments

This changes the behavior for:
* The `deg`  and `axis` arguments of `<type>der`
* The `deg`  and `axis` arguments of `<type>int`
* The `deg`  argument of `<type>gauss`
* The `deg`  argument of `<type>vander2d`
* The `deg`  argument of `<type>vander3d`

The old behavior was:
* Raise `ValueError` if the argument is a float, but not an integral one
* Allow a float like `1.0` to mean `1`.

This is inconsistent with most other integer-accepting APIs in numpy, which require these to be actual integers, and raise TypeError when they are not.

The new behavior is:
* Raise `TypeError` if the argument is a float, but not an integral one
* Emit a `DeprecationWarning` if a float like `1.0` is passed, continuing to allow it its old meaning.

1 files changed, 3 insertions, 3 deletions

diff --git a/numpy/polynomial/tests/test_hermite_e.py b/numpy/polynomial/tests/test_hermite_e.py
index ccb44ad73..434b30e7b 100644
--- a/numpy/polynomial/tests/test_hermite_e.py
+++ b/numpy/polynomial/tests/test_hermite_e.py
@@ -209,12 +209,12 @@ class TestIntegral(object):
 
     def test_hermeint(self):
         # check exceptions
-        assert_raises(ValueError, herme.hermeint, [0], .5)
+        assert_raises(TypeError, herme.hermeint, [0], .5)
         assert_raises(ValueError, herme.hermeint, [0], -1)
         assert_raises(ValueError, herme.hermeint, [0], 1, [0, 0])
         assert_raises(ValueError, herme.hermeint, [0], lbnd=[0])
         assert_raises(ValueError, herme.hermeint, [0], scl=[0])
-        assert_raises(ValueError, herme.hermeint, [0], axis=.5)
+        assert_raises(TypeError, herme.hermeint, [0], axis=.5)
 
         # test integration of zero polynomial
         for i in range(2, 5):
@@ -311,7 +311,7 @@ class TestDerivative(object):
 
     def test_hermeder(self):
         # check exceptions
-        assert_raises(ValueError, herme.hermeder, [0], .5)
+        assert_raises(TypeError, herme.hermeder, [0], .5)
         assert_raises(ValueError, herme.hermeder, [0], -1)
 
         # check that zeroth derivative does nothing