import matplotlib.pyplot as plt
import numpy as np


def range(n, vmin, vmax):
    return (vmax - vmin)*np.random.rand(n) + vmin


fig = plt.figure()
ax = fig.add_subplot(projection='3d')

n = 10

for m, zlow, zhigh in [('o', -50, -25)]:
    xs = range(n, 23, 32)
    ys = range(n, 0, 100)
    zs = range(n, zlow, zhigh)
    ax.scatter(xs, ys, zs, marker=m)

fig = plt.figure()
fig.add_subplot(111)
plt.scatter(xs, ys)

ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('Z')

plt.show()