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-rw-r--r--Lib/test/test_signal.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
index c3f5b14844..406684bdbe 100644
--- a/Lib/test/test_signal.py
+++ b/Lib/test/test_signal.py
@@ -5,6 +5,7 @@ import socket
import statistics
import subprocess
import sys
+import threading
import time
import unittest
from test import support