Changed "global cells" to "cells.clear()" #1
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cells = [] ２行を cells.clear() に置換
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global cells
cells = []
２行を
cells.clear() に置換しました。
cellsに空リストを代入するのでglobalが必要なのですが、
「グローバル変数に代入するときはglobalが必要」
ということを示すコードは def create_players(): の中の players で行っているので
ここではlistのclear()をあえて使わせてみたかった、という感じです。
もし業務で使うコードなら cells.clear() １発で済ますと思うし・・ということもあります。