Problème python erreur KeyboardInterrupt

from math import*
liste=[]
w = 0.5
r = 1
l=1
t=0

k=0
while t<20:
    if 0 + 2*k*3.1 <= t <= 3.1 + 2*k*3.1: #3,1 = pi/2w
        x,y,l = 0,r*sin(w*t),1
        liste.append((x,y,l))
        t += 0.1
        print(liste)
    if 3.1 + 2*k*3.1 < t <= 6.2 + 2*k*3.1: #6,2 = pi/2
        x,y,l = r*sin(w*t)-r,r,1
        liste.append((x, y, l))
        t += 0.1
    if 6.2 + 2*k*3.1 < t <= 9.4 + 2*k*3.1: #9,4 = 3pi/2w
        x,y,l = -r,r+r*sin(w*t),1
        liste.append((x, y, l))
        t += 0.1
    if 9.4 + 2*k*3.1 < t < 12.5 + 2*k*3.1: #12.5 = 2pi/w
        x,y,l = r*sin(w*t),0,1
        liste.append((x, y, l))
        t += 0.1
        if t == 12.5:
            k=k+1
import csv
with open ('carre.csv', 'w') as f:
    writer = csv.writer(f)
    writer.writerows(liste)