Merge pull request #10743 from fred-lefebvre/master

MAINT: Import abstract classes from collections.abc

1 files changed, 7 insertions, 2 deletions

diff --git a/numpy/lib/function_base.py b/numpy/lib/function_base.py
index 422a87322..07b845e2b 100644
--- a/numpy/lib/function_base.py
+++ b/numpy/lib/function_base.py
@@ -1,6 +1,11 @@
 from __future__ import division, absolute_import, print_function
 
-import collections
+try:
+    # Accessing collections abstact classes from collections
+    # has been deprecated since Python 3.3
+    import collections.abc as collections_abc
+except ImportError:
+    import collections as collections_abc
 import re
 import sys
 import warnings
@@ -547,7 +552,7 @@ def piecewise(x, condlist, funclist, *args, **kw):
     y = zeros(x.shape, x.dtype)
     for k in range(n):
         item = funclist[k]
-        if not isinstance(item, collections.Callable):
+        if not isinstance(item, collections_abc.Callable):
             y[condlist[k]] = item
         else:
             vals = x[condlist[k]]