import pandas as pd
import numpy as np


numAry1 = np.arange(100).reshape([20, 5])
df1 = pd.DataFrame(numAry1, columns=list('abcde'))
numAry2 = np.arange(100).reshape([20, 5])
df2 = pd.DataFrame(numAry1, columns=list('abcde'))



def count(row):
	res = row['a'] *12
	return res



df1['z'] = df1.apply(count, axis=1)
print(df1)