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app/timer.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+import time
+from types import TracebackType
+
+
+class Timer:
+    def __init__(self) -> None:
+        self.start_time: float | None = None
+        self.end_time: float | None = None
+
+    def __enter__(self) -> Timer:
+        self.start_time = time.time()
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> None:
+        self.end_time = time.time()
+
+    def elapsed(self) -> float:
+        if self.start_time is None or self.end_time is None:
+            raise ValueError("Timer has not been started or stopped.")
+        return self.end_time - self.start_time