Add a version number to pickles of ndarray and dtype.

This is backwards compatible. Also added test cases to make sure.

1 files changed, 4 insertions, 0 deletions

diff --git a/numpy/core/_internal.py b/numpy/core/_internal.py
index 20117d4fd..abd0342b6 100644
--- a/numpy/core/_internal.py
+++ b/numpy/core/_internal.py
@@ -100,6 +100,10 @@ def _array_descr(descriptor):
 
     return result
 
+# Build a new array from the information in a pickle.
+# Note that the name numpy.core._internal._reconstruct is embedded in
+# the pickles of ndarrays, so don't remove the name here, or you'll
+# break backward compatibilty.
 def _reconstruct(subtype, shape, dtype):
     return ndarray.__new__(subtype, shape, dtype)