diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
index e5ae9a0cc11c..6f757ae031ef 100644
--- a/lib/matplotlib/pyplot.py
+++ b/lib/matplotlib/pyplot.py
@@ -332,11 +332,21 @@ def draw_if_interactive():
def _warn_if_gui_out_of_main_thread():
- # This compares native thread ids because even if python-level Thread
- # objects match, the underlying OS thread (which is what really matters)
- # may be different on Python implementations with green threads.
- if (_get_required_interactive_framework(_get_backend_mod()) and
- threading.get_native_id() != threading.main_thread().native_id):
+ warn = False
+ if _get_required_interactive_framework(_get_backend_mod()):
+ if hasattr(threading, 'get_native_id'):
+ # This compares native thread ids because even if Python-level
+ # Thread objects match, the underlying OS thread (which is what
+ # really matters) may be different on Python implementations with
+ # green threads.
+ if threading.get_native_id() != threading.main_thread().native_id:
+ warn = True
+ else:
+ # Fall back to Python-level Thread if native IDs are unavailable,
+ # mainly for PyPy.
+ if threading.current_thread() is not threading.main_thread():
+ warn = True
+ if warn:
_api.warn_external(
"Starting a Matplotlib GUI outside of the main thread will likely "
"fail.")
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