Or, a bit shorter: 

$toggle_autoplay ^= 1;

[download]

Just to confuse things, 

$toggle_autoplay == 0 ? $toggle_autoplay = 1 : ($toggle_autoplay = 0);

[download]

would have worked (because it fixes the precedence problem you were having).

In reply to Re^2: Tk starting and stopping an autoplay loop using a keybinding by tybalt89
in thread Tk starting and stopping an autoplay loop using a keybinding by Discipulus

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