A value is trying to be set on a copy of a slice from a DataFrame 解決方案
1、當需要對dataFrame迭代賦值時，會產生上述錯誤，可採用下列方式
for i in duplicates.index:
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對某一列format
a['lon'].astype(float).map('{:.1f}'.format)
儲存時format 保留三位
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A value is trying to be set on a copy of a slice from a DataFrame 解決方案
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