Check if a Python object is a null externalptr
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When Python objects are serialized within a persisted R environment (e.g. .RData file) they are deserialized into null externalptr objects (since the Python session they were originally connected to no longer exists). This function allows you to safely check whether whether a Python object is a null externalptr.
py_validate function is a convenience function which calls
py_is_null_xptr and throws an error in the case that the xptr
Logical indicating whether the object is a null externalptr
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