Remove some redundant PY2 test specialisations.

Author: jeromekelleher

numcodecs/tests/test_vlen_array.py

@@ -7,7 +7,6 @@
 import pytest
 
 
-from numcodecs.compat import PY2
 try:
     from numcodecs.vlen import VLenArray
 except ImportError:  # pragma: no cover
@@ -78,8 +77,7 @@ def test_decode_errors():
         codec.decode(np.arange(2, 3, dtype='i4'))
     with pytest.raises(ValueError):
         codec.decode(np.arange(10, 20, dtype='i4'))
-    with pytest.raises(ValueError if PY2 else TypeError):
-        # exports old-style buffer interface on PY2, hence ValueError
+    with pytest.raises(TypeError):
         codec.decode(u'foo')
 
     # test out parameter

numcodecs/tests/test_vlen_bytes.py

@@ -7,7 +7,6 @@
 import pytest
 
 
-from numcodecs.compat import PY2
 try:
     from numcodecs.vlen import VLenBytes
 except ImportError:  # pragma: no cover
@@ -69,8 +68,7 @@ def test_decode_errors():
         codec.decode(np.arange(2, 3, dtype='i4'))
     with pytest.raises(ValueError):
         codec.decode(np.arange(10, 20, dtype='i4'))
-    with pytest.raises(ValueError if PY2 else TypeError):
-        # exports old-style buffer interface on PY2, hence ValueError
+    with pytest.raises(TypeError):
         codec.decode(u'foo')
 
     # test out parameter

numcodecs/tests/test_vlen_utf8.py

@@ -7,7 +7,6 @@
 import pytest
 
 
-from numcodecs.compat import PY2
 try:
     from numcodecs.vlen import VLenUTF8
 except ImportError:  # pragma: no cover
@@ -65,8 +64,7 @@ def test_decode_errors():
         codec.decode(np.arange(2, 3, dtype='i4'))
     with pytest.raises(ValueError):
         codec.decode(np.arange(10, 20, dtype='i4'))
-    with pytest.raises(ValueError if PY2 else TypeError):
-        # exports old-style buffer interface on PY2, hence ValueError
+    with pytest.raises(TypeError):
         codec.decode(u'foo')
 
     # test out parameter