讀取完csv文件，進行運算，重新復制彈出A value is trying to be set on a copy of a slice from a DataFrame.
解決方法如下：
個人理解是這里的變量引用是直接尋址，不允許改變原變量的值，要將原變量的值復制出來，進行運算。個人理解，有錯誤還請指出學習一下
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[Python Debug] SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame.
[pandas] SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
Pandas - A value is trying to be set on a copy of a slice from a DataFrame（轉）
pandas錯誤處理：A value is trying to be set on a copy of a slice from a DataFrame
問題解決：SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
問題解決：SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
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