import numpy as np
from matplotlib import pyplot as plt
from matplotlib.animation import FuncAnimation
plt.style.use('seaborn-pastel')

fig = plt.figure()
ax = plt.axes(xlim=(0, 4), ylim=(-2, 2))
line, = ax.plot([], [], lw=3)

def init():
    line.set_data([], [])
    return line,
def animate(i):
    x = np.linspace(0, 4, 1000)
    y = np.sin(2 * np.pi * (x - 0.01 * i))
    line.set_data(x, y)
    return line,

anim = FuncAnimation(fig, animate, init_func=init,
                               frames=200, interval=20, blit=True)

anim.save('sine_wave.gif', writer='imagemagick')

<?php
    echo "Hello, world!\n";
?>

Piemērs no HTML5 specifikācijas

You are in an open field west of a big white house with a boarded
front door.
There is a small mailbox here.

> open mailbox

Opening the mailbox reveals:
A leaflet.

>