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Pandas DataFrame bfill() 方法

❮ DataFrame 参考


示例

用下一行的值替换 NULL 值

在本例中,我们使用了一个名为 data.csv 的 .csv 文件

import pandas as pd

df = pd.read_csv('data.csv')

newdf = df.bfill()
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定义和用法

bfill() 方法用下一行的值替换 NULL 值(或者如果 axis 参数设置为 'columns',则用下一列的值替换)。


语法

dataframe.bfill(axis, inplace, limit, downcast)

参数

axismethodaxisinplacelimitdowncast 参数是 关键字参数

参数 描述
axis 0
1
'index'
'columns'
可选,默认值为 0。要沿其填充 NULL 值的轴
inplace True
False
可选,默认值为 False。如果为 True:则在当前 DataFrame 上进行替换。如果为 False:则返回一个已进行替换的副本。
limit 数字
None
可选,默认值为 None。指定要填充的最大 NULL 值数量
downcast 字典
None
可选,一个用于填充特定数据类型的值的字典

返回值

包含结果的 DataFrame,如果 inplace 参数设置为 True,则返回 None。


❮ DataFrame 参考

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