Apply formatting to num seconds

tenacity/before_sleep.py

@@ -32,6 +32,7 @@ def before_sleep_log(
     logger: "logging.Logger",
     log_level: int,
     exc_info: bool = False,
+    sec_format: str = "%.3g",
 ) -> typing.Callable[["RetryCallState"], None]:
     """Before call strategy that logs to some logger the attempt."""
 
@@ -65,7 +66,7 @@ def log_it(retry_state: "RetryCallState") -> None:
         logger.log(
             log_level,
             f"Retrying {fn_name} "
-            f"in {retry_state.next_action.sleep} seconds as it {verb} {value}.",
+            f"in {sec_format % retry_state.next_action.sleep} seconds as it {verb} {value}.",
             exc_info=local_exc_info,
         )