[Python] How to focus tksheet in tkinter window

I am trying to focus a tksheet so I can use the arrows to move around the cells, but nothing is working. I am trying to understand this documentation.

I tried

def key_table(event):
sheet.focus_set('table')


paired with

sheet = tksheet.Sheet(root, height=200, width=1500, auto_resize_columns=30)
root.bind("<F7>", key_table)


but when I press F7 and try to arrow or tab around the table nothing happens. It does switch focus away from the default focus (a text box), but not to the tksheet sheet, at least not that I can tell.

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