matplotlib: plot multiple 2d line in 3d

plot.py

"""
=======================
Plot 2D data on 3D plot
=======================

Demonstrates using ax.plot's zdir keyword to plot 2D data on
selective axes of a 3D plot.
"""

from mpl_toolkits.mplot3d import Axes3D
import numpy as np
import matplotlib.pyplot as plt

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

# Plot a sin curve using the x and y axes.
for z in range(0, 50):
    x = np.linspace(0, 1, 100)
    y = z * np.sin(x * 2 * np.pi) / 50 / 2 + 0.5
    ax.plot(x, y, zs=z, zdir='z', label='curve in (x,y)')


# Make legend, set axes limits and labels
ax.legend()
ax.set_xlim(0, 1)
ax.set_ylim(0, 1)
ax.set_zlim(0, 50)
ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('Z')

# Customize the view angle so it's easier to see that the scatter points lie
# on the plane y=0
ax.view_init(elev=20., azim=-35)

plt.show()