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Allow Output.clear_output() to be thread-safe. #3261

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Allow Output.clear_output() to be thread-safe. #3261

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11 changes: 9 additions & 2 deletions ipywidgets/widgets/widget_output.py
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Original file line number Diff line number Diff line change
Expand Up @@ -72,9 +72,16 @@ def clear_output(self, *pargs, **kwargs):
wait: bool
If True, wait to clear the output until new output is
available to replace it. Default: False

If any parameters are given, then this should be run on the main thread,
because race conditions may occur if run from multiple threads. It is
safe to call this function without any arguments from multiple threads.
"""
with self:
clear_output(*pargs, **kwargs)
if not pargs and not kwargs:
self.outputs = ()
else:
with self:
clear_output(*pargs, **kwargs)

# PY3: Force passing clear_output and clear_kwargs as kwargs
def capture(self, clear_output=False, *clear_args, **clear_kwargs):
Expand Down