Python controle Constrain to Image Bounds is it possible to controle True/False checkbox from "UV/Image Editor > UVs > Constrain to Image Bounds" via Python Console ?
Look in info area

In this case if we open an info window and toggle the setting in the image editor



We see the property is lock_bounds of the uv_editor settings of the image editor space.
Python console code to get there, in same screen. Beware: currently trying to auto complete an image editor  space from another (other than context) screen core dumps my 2.8 build

&gt;&gt;&gt; for i, a in enumerate(C.screen.areas):
...     i, a.type
...     
(0, 'PROPERTIES')
(1, 'CONSOLE')
(2, 'OUTLINER')
(3, 'VIEW_3D')
(4, 'IMAGE_EDITOR')
(5, 'INFO')

&gt;&gt;&gt; a  = C.screen.areas[4]
&gt;&gt;&gt; s = a.spaces.active
&gt;&gt;&gt; s
bpy.data.screens['Scripting.001']...SpaceImageEditor

&gt;&gt;&gt; s.uv_editor.lock_bounds = True
&gt;&gt;&gt;


Although can set without, for the menu to show, mesh object needs a UV map and be in edit mode.