diff --git a/test_threading.py b/test_threading.py
index dbd69dc..0e9cc1f 100644
--- a/test_threading.py
+++ b/test_threading.py
@@ -2,8 +2,10 @@
 import threading
 import time
 import os
+import sys
 import random
 
+
 class Aclass(threading.Thread):
     def __init__(self, dev, ID):
         threading.Thread.__init__(self)
@@ -12,7 +14,7 @@ class Aclass(threading.Thread):
         self.dev = dev
         self.id = ID
         print(self.id)
-    
+
     def run(self):
         while self.running:
             while self.dev.using == True:
@@ -23,12 +25,17 @@ class Aclass(threading.Thread):
             print(self.id, os.getpid(), os.getppid(), self.running)
             time.sleep(1)
 
+    def stop(self):
+        sys.exit()
+
+
 class dev():
     def __init__(self):
         self.using = False
         self.gets = {'a': False, 'b': False}
         self.running = {'a': True, 'b': True}
 
+
 Dev = dev()
 A = Aclass(Dev, 'a')
 time.sleep(random.random())
@@ -36,13 +43,17 @@ B = Aclass(Dev, 'b')
 A.start()
 B.start()
 print("hmmm")
-while True:
-    In = input()
-    if In == "stop":
-        Dev.running['a'] = False
-        Dev.running['b'] = False
-        break
-    try:
-        eval(In)
-    except:
-        print(EnvironmentError)
\ No newline at end of file
+try:
+    while True:
+        In = input()
+        if In == "stop":
+            Dev.running['a'] = False
+            Dev.running['b'] = False
+            break
+        try:
+            eval(In)
+        except:
+            print(EnvironmentError)
+except KeyboardInterrupt:
+    A.stop()
+    B.stop()