将数据帧传递给应用函数 pandas 作为参数 [英] Pass Dataframe to Apply function pandas as argument

问题描述

是否可以像这样将 DataFrame 传递给 apply 函数?

Is possible to pass a DataFrame to an apply function like this?

df2 = df1.apply(func,axis=1,args=df2)
def func(df1,df2):
    # do stuff in df2 for each row of df1
    return df2

两个 DataFrame 的长度不同.

The two DataFrames do not have the same length.

推荐答案

来自 df.apply 文档:

From the df.apply docs:

DataFrame.apply(func,axis=0,broadcast=False,raw=False,reduce=None,args=(), **kwds)

沿输入轴应用函数数据帧.

Applies function along input axis of DataFrame.

args : tuple

除了传递给函数的位置参数数组/系列.

Positional arguments to pass to function in addition to the array/series.

正确的方法是在元组中传递参数，如下所示:

The right way is to pass your arguments in a tuple, like this:

df1.apply(func, axis=1, args=(df2, ))

如果知道您要实现的目标，就有可能进一步改进您的代码.

Further improvements to your code would be possible if it were known what you are trying to achieve.

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