Adding unittest.removeHandler function / decorator for removing the signal.SIGINT signal handler. With tests and docs.

Lib/unittest/signals.py

@@ -1,6 +1,8 @@
 import signal
 import weakref
 
+from functools import wraps
+
 __unittest = True
 
 
@@ -36,3 +38,20 @@ def installHandler():
         default_handler = signal.getsignal(signal.SIGINT)
         _interrupt_handler = _InterruptHandler(default_handler)
         signal.signal(signal.SIGINT, _interrupt_handler)
+
+
+def removeHandler(method=None):
+    if method is not None:
+        @wraps(method)
+        def inner(*args, **kwargs):
+            initial = signal.getsignal(signal.SIGINT)
+            removeHandler()
+            try:
+                return method(*args, **kwargs)
+            finally:
+                signal.signal(signal.SIGINT, initial)
+        return inner
+
+    global _interrupt_handler
+    if _interrupt_handler is not None:
+        signal.signal(signal.SIGINT, _interrupt_handler.default_handler)