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怎样在dataframe中添加一列,使其值等于所在行的index值的两倍?

有一个df,想增加一列df['new']=df.index值*2
请问如何写代码,谢谢。


用map和list也可以

import pandas as pd
df=pd.DataFrame(["a","b","c"],columns=["F"])
def foo(income):
   return("income"+str(income))

df["page"]=list(map(foo,df.index))
print(df)

image.png


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1 Answer

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by (71.8m points)

你不是已经写出来了吗 - -
df['new']=df.index * 2


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