Close #184: only call _repr_mimebundle_ if it exists and is callable

Author: cpsievert

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED]
 
+* Fixes 'AttributeError: object has no attribute "_repr_mimebundle_"'. (#184)
 
 ## [0.5.0] - 2025-01-29
 

shinywidgets/_shinywidgets.py

@@ -125,7 +125,8 @@ def _open_shiny_comm():
         # Call _repr_mimebundle_() before get_state() since it may modify the widget
         # in an important way (unfortunately, it does for plotly)
         # # https://github.com/plotly/plotly.py/blob/0089f32/packages/python/plotly/plotly/basewidget.py#L734-L738
-        w._repr_mimebundle_()
+        if hasattr(w, "_repr_mimebundle_") and callable(w._repr_mimebundle_):
+            w._repr_mimebundle_()
 
         # Now, get the state
         state, buffer_paths, buffers = _remove_buffers(w.get_state())