fix monitor `RuntimeError`

- fixes #481
2021-08-23 16:10:25 +01:00 · 2021-08-23 16:10:25 +01:00 · b6326c27ed
parent 140c94855b
commit b6326c27ed
1 changed files with 9 additions and 4 deletions
--- a/tqdm/_monitor.py
+++ b/tqdm/_monitor.py
@ -45,10 +45,15 @@ class TMonitor(Thread):
        return self.report()

    def get_instances(self):
-        # returns a copy of started `tqdm_cls` instances
-        return [i for i in self.tqdm_cls._instances.copy()
-                # Avoid race by checking that the instance started
-                if hasattr(i, 'start_t')]
+        """returns a copy of started `tqdm_cls` instances"""
+        for _ in range(3):  # retry
+            try:
+                return [i for i in self.tqdm_cls._instances.copy()
+                        # Avoid race by checking that the instance started
+                        if hasattr(i, 'start_t')]
+            except RuntimeError:
+                pass
+        return []

    def run(self):
        cur_t = self._time()