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Pandas DataFrame transform() 方法

❮ DataFrame 参考


示例

返回每一行的总和

import pandas as pd

def eur_to_nok(x)
  return x * 10

data = {
  "for1": [2, 6, 3],
  "for5": [8, 20, 12]
}

df = pd.DataFrame(data)

newdf = df.transform(eur_to_nok)

print(newdf)
自己尝试一下 »

定义和用法

The transform() 方法允许您对 DataFrame 的每个值执行一个函数。


语法

dataframe.transform(func, axis, raw, result_type, args, kwds)

参数

The axis 参数是 关键字参数

参数 描述
func   必填。要在 DataFrame 的值上执行的函数、函数名或函数名列表。
axis 0
1
'index'
'columns'
可选,要应用函数的轴。默认为 0。
args   可选,发送到函数中的参数
kwargs   可选,发送到函数中的关键字参数

 返回值

一个 DataFrameSeries 对象,包含更改后的内容。

此函数不会对原始 DataFrame 对象进行更改。


❮ DataFrame 参考

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