Start 3 phase power

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import math

data = pd.read_excel("C:\\Users\\223117394\\Documents\\Hioki Power Scope test 1.xlsx")
data = np.array(data)
#print(data)
PFa = data[18,[1,2,3,4,5,6]]
print(PFa)
size = len(PFa)
print(size)
Angle = []
i=0
for i in range(0,size,1):
    Angle_a = math.acos(PFa[i-1])*100
    Angle_a = round(Angle_a)
    Angle_a = np.array(Angle_a)
    print(Angle_a)
    np.append(x,i,Angle_a)
print(x)