Conditionally import BrokenProcessPool

It's not available in the concurrent.futures backport.

1 files changed, 5 insertions, 1 deletions

diff --git a/apscheduler/executors/pool.py b/apscheduler/executors/pool.py
index 302d4bd..b3a4caf 100644
--- a/apscheduler/executors/pool.py
+++ b/apscheduler/executors/pool.py
@@ -1,9 +1,13 @@
 from abc import abstractmethod
-from concurrent.futures.process import BrokenProcessPool
 import concurrent.futures
 
 from apscheduler.executors.base import BaseExecutor, run_job
 
+try:
+    from concurrent.futures.process import BrokenProcessPool
+except ImportError:
+    BrokenProcessPool = None
+
 
 class BasePoolExecutor(BaseExecutor):
     @abstractmethod