Adding column(s) from one dataframe to another python pandas

import pandas as pd
import io

data = """
ColumnA    columnB    columnC   columnD
  A          B          C          D
  A          B          C          D
  A          B          C          D
    """
data1 = """
ColumnE    columnF    columnG
  E          F          G
  E          F          G
  E          F          G
    """

df = pd.read_csv(io.StringIO(data), delimiter='\s+')
df1 = pd.read_csv(io.StringIO(data1), delimiter='\s+')

df['columnF'] = pd.Series(df1['columnF'])

print(df)

Will give you:

  ColumnA columnB columnC columnD columnF
0       A       B       C       D       F
1       A       B       C       D       F
2       A       B       C       D       F

import pandas as pd
f_column = data2["columnF"]
data1 = pd.concat([data1,f_column], axis = 1)
data1

     columnA      columnB     columnC     columnF
0       a            b            c         f
1       a            b            c         f
2       a            b            c         f