Column order in pandas.concat

Question

I do as below:

data1 = pd.DataFrame({ \'b\' : [1, 1, 1], \'a\' : [2, 2, 2]})
data2 = pd.DataFrame({ \'b\' : [1, 1, 1], \'a\' : [2, 2, 2]})
frames = [data1, data2         


        

Answer 1

Simplest way is firstly make the columns same order then concat:

df2=df2[df1.columns]
df=pd.concat((df1,df2),axis=0)