A value is trying to be set on a copy of a slice from a DataFrame
2017-10-05 21:20
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在为DataFrame对象新增一列数据时，报错“A value is trying to be set on a copy of a slice from a DataFrame”，原因是操作的数据不是原始数据，而是原始数据的视图。
解决方案:在新增列之前，显示复制原始数据。示例如下：
data4 = train_data[['uid', 'forward_count', 'like_count']].copy()
data4['forward_like_rate'] = data4['forward_count'] / (data4['like_count'] + 1)
解决方案:在新增列之前，显示复制原始数据。示例如下：
data4 = train_data[['uid', 'forward_count', 'like_count']].copy()
data4['forward_like_rate'] = data4['forward_count'] / (data4['like_count'] + 1)
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