import numpy as np
import matplotlib.pyplot as plt

M = np.loadtxt('ra_data.txt', delimiter=' ')

Kj = M[:, 0] #kjonn
Kl = M[:, 1] #klassetrinn
Timer = M[:, 2] #antall timer skjermbruk per pers

t8 = 0
t9 = 0
t10 = 0

for n in range(0, len(Timer), 1):
    
    if (Kl[n] == 8):
        t8 = t8 + Timer[n]
        
    elif(Kl[n] == 9):
        t9 = t9 + Timer[n]
        
    else:    
        t10 = t10 +  Timer[n]

klassetrinn = '8. Klasse', '9. Klasse', '10. Klasse'
sizes = [t8, t9, t10]

# Plotting:

plt.close('all')
plt.figure(1, figsize=(12, 9))
plt.pie(sizes, labels=klassetrinn, autopct='%1.1f%%')
plt.axis('equal')  
plt.show()