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-rw-r--r--Lib/doctest.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 476c718f02..64a0375da3 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1360,6 +1360,7 @@ class DocTestRunner:
linecache.getlines = self.save_linecache_getlines
if clear_globs:
test.globs.clear()
+ __builtins__['_'] = None
#/////////////////////////////////////////////////////////////////
# Summarization