从两个现有数据帧中创建一个新的 pandas dataframe

Question

I have two existing dataframes df_A and df_B with columns X and Y :

df_A

X Y
abc def
ghi jkl

df_B

X Y
mno pqr
stu vwx
zya bcd

I now want to create a new dataframe df_new which contains the columns name and length , where length is length of df_A and df_B . It should look like this one.

name length
A 2
B 3

How could I do this?

Answer 1

There are several ways to do this, varying in the level of automation and abstraction. Here is a rather manual way:

df_new = pd.DataFrame({
    'name': ['A', 'B'],
    'length': map(len, [df_A, df_B])
})