在熊猫中水平组合三个数据框

Question

I have three data frames each of shape 100*100 how i combine them horizontally to a new data frame of shape 300*100? I tried using these commands:

result = df1.combine_first(df2) 

result = pd.concat([df1, df2], axis=1, join_axes=[df1.index])

result = df1.append(df2, ignore_index=True)

But non gave the desired result of a data frame of shape 300*100. How i can do that?

Answer 1

If you want to combine 3 100 x 100 df s to get an output of 300 x 100 , that implies you want to stack them vertically. So, try axis=0 .

It might be necessary to rename your columns first, so you could do that in a loop.

df_list = [df1, df2, df3]    
for d in df_list[1:]:
    d.columns = df_list[0].columns

---

df = pd.concat(df_list, axis=0, ignore_index=True)