How can I merge together several pandas dataframes on a certain column without 'pandas.merge'?

Question

I often find myself with several pandas dataframes in the following form:

import pandas as pd
df1 = pd.read_table(\'filename1.dat\')
df2 = pd.read_table(\'filen         


        

Answer 1

You can set columnA as the index and concat (reset index at the end):

dfs = [df1, df2, df3]

pd.concat([df.set_index('columnA') for df in dfs], axis=1).reset_index()
Out: 
  columnA  first_values  second_values  third_values
0   name1           342              8           910
1   name2           822              1           301
2   name3           121              1           132
3   name4          3434              2           299