TypeError: bar() missing 1 required positional argument: ‘x‘
運行代碼時，出現錯誤：TypeError: bar() missing 1 required positional argument: 'x’如何解決呢？ 意思是：bar（）缺少1個必需的位置參數：「x」 解決方法：將代碼plt.bar中的left改爲x. 成功解決問題：
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