Toggle the updating of object thumbnails. These are visible in tools like the Attribute Editor and Hypershade. All thumbnails everywhere will not update to reflect changes to the object until this command is used to toggle to true. In query mode, return type is based on queried flag.
Derived from mel command maya.cmds.renderThumbnailUpdate
Example:
import pymel.core as pm
# Turns on thumbnail updates.
pm.renderThumbnailUpdate(True)
# Turns off thumbnail updates.
pm.renderThumbnailUpdate(False)