#!/usr/bin/env python
# -*- coding:utf-8 -*-
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
def _update_plot(j, fig, scat): # от куда беруться значения переменной j
    scat.set_offsets(([0,j], [j,50], [j,j]))
    return scat
fig = plt.figure()
x = [ ]
y = [ ]
ax = fig.add_subplot(111)
ax.grid(True, linestyle = '-', color = '0.75')
ax.set_xlim([-50, 200])
ax.set_ylim([-50, 200])
scat = plt.scatter(x, y, c = x)
scat.set_alpha(0.8) # зачем нужен этот альфа?
anim = animation.FuncAnimation(fig, _update_plot, fargs = (fig, scat),
                               frames = 100, interval = 20)
plt.show()

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
a = iter([[0,0], [10, 20], [10, 10], [0, 0], [100, 0], [100, 50], [50, 50], [0, 0]])
def _update_plot(j, fig, scat):
    scat.set_offsets((a.next()))
    return scat
fig = plt.figure()
x = [ ]
y = [ ]
ax = fig.add_subplot(111)
ax.grid(True, linestyle = '-', color = '0.75')
ax.set_xlim([-50, 200])
ax.set_ylim([-50, 200])
scat = plt.scatter(x, y, c = x)
anim = animation.FuncAnimation(fig, _update_plot, fargs = (fig, scat),
                               frames = 100, interval = 200)
plt.show()

scat.set_alpha(0.8) # зачем нужен этот альфа?

def _update_plot(j, fig, scat): # от куда беруться значения переменной j

Mercury[i][0] = merc_x0/ae # координаты x 
Mercury[i][2] = merc_y0/ae # координаты y

scat.set_offsets((a.__next__()))

[Mercury[i][0] for i in range(N)]
[Mercury[i][2] for i in range(N)]

Mercury = [[1,2,30], [4,5,15], [17,8,9], [10,11,12], [13,14,5]]
Mx = iter(Mercury[i][0] for i in range(5))
My = iter(Mercury[i][2] for i in range(5))
def _update_plot(j, fig, scat):
    scat.set_offsets((Mx.__next__(), My.__next__()))