index 1 is out of bounds when performing independence test

I am doing independence test & try to find expected values, however I do not understand how to resolve this issue with traceback. Help me to find the problem in code, please.

    #Exercise 6.46.
import matplotlib.pyplot as plt
import numpy as np
import math
import seaborn as sns
import pandas as pd
%matplotlib inline
data = pd.DataFrame([[264,299,351,264+299+351], [38,55,77,38+55+77], [16,15,22, 16+15+22], [318,369,450, 318+369+450]], 
                    index=['Should', 'Should Not', 'No answer', "Total",], 
                    columns=['Republican', 'Democrat', "Independent", "Total",])
print(data)

#Expected Values
col_sums= data.iloc[0:3,3].values
row_sums = data.iloc[3:4,0:3].values
print(col_sums)
print(row_sums)

total = data.loc['Total', 'Total']
print(total)
f_expected = []
for j in range(3):
    for i in col_sums:
        f_expected.append(i*row_sums[j]/total)
print(f_expected)

---

Here is the traceback: --- IndexError Traceback (most recent call last) in () 22 for j in range(3): 23 for i in col_sums: ---> 24 f_expected.append(i*row_sums[j]/total) 25 print(f_expected) 26

IndexError: index 1 is out of bounds for axis 0 with size 1