X-Git-Url: https://wannabe.guru.org/gitweb/?a=blobdiff_plain;f=stopwatch.py;fp=stopwatch.py;h=ae8e01aa18452ed932ef589b9047c7f0c68ab58a;hb=2f5b47c8b30d1b7d86443391332be2f3805cdafd;hp=fa4f2b52f54998bb029f7e14433e5451abd67812;hpb=4b04fd1d5a14c5c4c7e0985e5376b4e2f879ef06;p=python_utils.git

diff --git a/stopwatch.py b/stopwatch.py
index fa4f2b5..ae8e01a 100644
--- a/stopwatch.py
+++ b/stopwatch.py
@@ -2,11 +2,12 @@
 
 """A simple stopwatch decorator / context for timing things."""
 
+import contextlib
 import time
-from typing import Callable, Optional
+from typing import Callable, Literal
 
 
-class Timer(object):
+class Timer(contextlib.AbstractContextManager):
     """
     A stopwatch to time how long something takes (walltime).
 
@@ -31,6 +32,6 @@ class Timer(object):
         self.end = 0.0
         return lambda: self.end - self.start
 
-    def __exit__(self, *args) -> Optional[bool]:
+    def __exit__(self, *args) -> Literal[False]:
         self.end = time.perf_counter()
-        return None  # don't suppress exceptions
+        return False