Hello world!

This is the current date and time, as computed by Python:
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.animation as animation
t = np.linspace(0, 3, 20)
g = -9.81
v0 = 12
z = g * t**2 / 2 + v0 * t
v02 = 5
z2 = g * t**2 / 2 + v02 * t
print( "Vitesse = " + v02)
print( "r2 = " + v02)