adding two Pandas dataframes

add_pandas.py

import numpy as np
import pandas as pd

df1 = pd.DataFrame([(1,2),(2,4),(5,6)], columns=['a','b'])
df1
df2 = pd.DataFrame([(100,200),(300,400),(500,600)], columns=['a','b'])
df2

df_add = df1.add(df2, fill_value=0)
df_add

# df3 = pd.DataFrame([(1,10),(2,20),(3,30)], columns=['a','b']).groupby('a')
# df4 = pd.DataFrame([(1,100),(2,200),(3,300)], columns=['a','b']).groupby('a')

# df_add2 = df3.add(df4, fill_value=0)