Add information about signal handler

pages/04.other/python/default.en.md

@@ -45,3 +45,22 @@ except KeyboardInterrupt:
     # return SIGINT code
     exit(130)
 ```
+
+A potentially better way of handling keyboard interrupts is using a signal handler.
+
+```python
+import time
+import signal
+import sys
+
+def signal_handler(signal, frame):
+    print("\nKeyboard Interrupt detected.")
+    # add your cleanup code here
+    sys.exit(0)
+
+# register signal handler
+signal.signal(signal.SIGINT, signal_handler)
+
+while True:
+    time.sleep(1)
+```