Invalid syntax in gui/eight_puzzle.py #896
Description
I'm trying to run the Gui examples, with:
python3 -i gui/eight_puzzle.py
And get the next out:
File "gui/eight_puzzle.py", line 88
b[zero_ix] = Button(root, text=f'{state[index]}', width=6, font=('Helvetica', 40, 'bold'), command=partial(exchange, zero_ix))
^
SyntaxError: invalid syntax
I've python 3.5.2 and Ubuntu 16.04.
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