Forward kinematics python

import math
import matplotlib.pyplot as plt

n_theta =10

theta_start=0
theta_end =math.pi/2

l1=1
l2=0.5

theta1=[]
theta2=[]

for i in range(0,n_theta):
	temp=theta_start+ i* (theta_end - theta_start)/(n_theta-1)
	theta1.append(temp)
	theta2.append(temp)

x0=0
y0=0

ct=1
for t1 in theta1:
	for t2 in theta2:
		x1= l1*math.cos(t1)
		y1= l1*math.sin(t1)

		x2= x1+l2*math.cos(t2)
		y2= x2+l2*math.sin(t2)

		filename = str(ct) + '.png'
		ct=ct+1


		plt.figure()
		plt.plot([x0,x1],[y0,y1])
		plt.plot([x1,x2],[y1,y2])
		plt.xlim([0,2])
		plt.ylim([0,2])
		plt.savefig(filename)