Fix Python 3.13 compat by adding missing attibute '_is_main_interpreter'

4383 · 4383 · commit 11d5dd9fd297 · 2023-12-19T12:02:27.000+01:00
python/cpython#112826 Python 3.13 doesn't have workaround and so eventlet is broken with Python versions higher than 3.12. Fix eventlet#838 Fix eventlet#604
diff --git a/NEWS b/NEWS
@@ -2,6 +2,7 @@ Unreleased
 ==========
 
 * Dropped support for Python 3.7 and earlier.
+* Fix Python 3.13 compat by adding missing attibute '_is_main_interpreter' https://github.com/eventlet/eventlet/pull/847
 
 0.33.3
 ======
diff --git a/eventlet/green/thread.py b/eventlet/green/thread.py
@@ -15,6 +15,8 @@
 LockType = Lock
 __threadcount = 0
 
+if hasattr(__thread, "_is_main_interpreter"):
+    _is_main_interpreter = __thread._is_main_interpreter
 
 if six.PY3:
     def _set_sentinel():
