import from module and not from module.py

Thanks to Justin Riley for noticing.

Signed-off-by: Thomas Spura <[e-mail]>

IPython/external/decorators/__init__.py

@@ -1,4 +1,4 b''
 try:
     from numpy.testing.decorators import *
 except ImportError:
-    from _decorators.py import *
+    from _decorators import *