I have an issue finding the correct documentation online.


CTRL + A calls the following command:


And a selection option reads out the following command:

bpy.ops.object.transform_apply(location=False, rotation=True, scale=False)


Now by trial and error I found out that if you want to call an operator it has to be formatted the following way:

row.operator("wm.call_menu", text="Apply Tans").name="VIEW3D_MT_object_apply"
row.operator("object.transform_apply", text="Apply Rot").rotation=True

name and rotation have to come after the operator closing bracket to pass that information to the operator.

Where can you in the Blender Python API find this information? I searched for it but do not find anything about the correct syntax.

  • $\begingroup$ duplicate ? blender.stackexchange.com/q/2515/5113 $\endgroup$ – Chebhou Jan 8 '16 at 18:10
  • $\begingroup$ I read this earlier and this option works by first generating a class that can execute the complete bpy command. Then command name is given to the button to operate/ execute. I am more interested in a solution that is only one line long - if that is actually possible. $\endgroup$ – Claas Kuhnen Jan 8 '16 at 18:14
  • $\begingroup$ the one line solution is working fine check your full script $\endgroup$ – Chebhou Jan 8 '16 at 18:16

The docs have this information if you know what you're looking for.


In this case TextEditor > Templates > Python > UI Menu has a working example of how to trigger a specific menu

The UI source is often the most comprehensive documentation. For example space_view3d.py's class VIEW3D_MT_mirror(Menu) shows how to pass properties to an operator. As you have now seen

props = layout.operator("transform.mirror", text="Z Global")
props.constraint_axis = (False, False, True)
props.constraint_orientation = 'GLOBAL'

Here both constraint_axis and constraint_orientation are passed as values to bpy.ops.transform.mirror as soon as the button is pressed.


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