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https://bravikov.wordpress.com/2016/10/26/idle-%d0%b2-%d0%ba%d0%b0%d1%87%d0%b5%d1%81%d1%82%d0%b2%d0%b5-%d0%ba%d0%b0%d0%bb%d1%8c%d0%ba%d1%83%d0%bb%d1%8f%d1%82%d0%be%d1%80%d0%b0/
IDLE в качестве калькулятора