passing rows of dataframe as argument to a function in python

Question

I am trying to pass columns of a dataframe as arguments to function in row wise manner but I am ending in an error. I tried to do by loop as my actual dataframe and function requires loop only.

def sum(x, y, z):
     return x + y + z
Input = pd.DataFrame({'A': [1, 2,3], 'B': [10, 20,22],'C':[4,5,6]})
output = pd.DataFrame({'output': [15, 27,31]})

##What I tried, but this tells me it needs more arguments
for a in Input:
    sum(a)

Could anyone help me, as I need to iterate all the rows of dataframe as in argument to a function so in short number of columns of dataframe is equal to number of arguments in functions

Answer 1

Try this

Input.apply(lambda row : sum(row.A, row.B, row.C), axis=1)

axis = 1, mean on column level. can refer at pandas apply It asks for more arguments because it does not know which column you want to do operation.