How to access the Kemap settings Preferences (Spacebar Action, Select Mouse button, etc) with python?

Question

I use a python script to set up some startup preferences like this:

bpy.context.preferences.view.show_tooltips_python = True

However, there is a particular set of preferences I don't know how to access, the ones in the Keymap section where you specify what spacebar does, what mouse click you use to select, etc.

How can I access these settings?

Answer 1

Search the source

With Developer Extras turned on hover over the enum and choose edit source

This will open up (for me) scripts/keyconfigs/blender.py

    # General settings.
    col = layout.column()
    col.row().prop(self, "select_mouse", text="Select with Mouse Button", expand=True)
    col.row().prop(self, "spacebar_action", text="Spacebar Action", expand=True)
    if is_select_left:
        col.row().prop(self, "gizmo_action", text="Activate Gizmo Event", expand=True)

Notice there is a generic property update method load(self, context)

def load():
    from sys import platform
    from bpy import context
    from bl_keymap_utils.io import keyconfig_init_from_data

    prefs = context.preferences
    kc = context.window_manager.keyconfigs.new(IDNAME)
    kc_prefs = kc.preferences

Ok then to the python console

>>> C.preferences.keymap.active_keyconfig
'blender'

>>> C.window_manager.keyconfigs['blender'].preferences['spacebar_action'] = 2

will set to the third option. The item that matches that number is available enum definition of the the Prefs class.