[3.6] bpo-31792: Restore os.environ in test_buffer when import numpy. (GH-4007) (#4009)

miss-islington · serhiy-storchaka · commit 06949585d292 · 2017-10-16T11:21:30.000+03:00
(cherry picked from commit 676db4b)
diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py
@@ -17,7 +17,7 @@
 from itertools import permutations, product
 from random import randrange, sample, choice
 import warnings
-import sys, array, io
+import sys, array, io, os
 from decimal import Decimal
 from fractions import Fraction
 
@@ -37,7 +37,8 @@
     ctypes = None
 
 try:
-    with warnings.catch_warnings():
+    with support.EnvironmentVarGuard() as os.environ, \
+         warnings.catch_warnings():
         from numpy import ndarray as numpy_array
 except ImportError:
     numpy_array = None
