To create a cartesian product in Python Pandas, we call the data frame merge method with how set to 'cross'.
For instance, we write
from pandas import DataFrame
df1 = DataFrame({'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'col3':[5,6]})
df1.merge(df2, how='cross')
to call df1.merge with df2 and the how argument set to 'cross' to return cartesian product between df1 and df2.
