Applescript code completion shortcut

Personally, I don't like the Escape key to auto-complete.

To add your own key to auto-complete, go to

• System Preferences > Keyboard > Shortcuts > App Shortcuts

and add an entry for Script Editor (select "Other" and then go to Utilities in Finder) named Complete. You can then choose your own shortcut to auto-complete in the Script Editor.

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Here's a screenshot for Ctrl + Space.

It probably changed whith sierra or High-Sierra :

It's now option + escape keys.

You can use Script Assistant's Auto-Completion with the Option + Esc key.