td.py

#!/usr/bin/python
import matplotlib as mpl
from mpl_toolkits.mplot3d import Axes3D
import numpy as np
import matplotlib.pyplot as plt
import sys

#plt.rc('text', usetex=True)
#plt.rc('font', **{'family':'monospace','monospace':['Ubuntu Mono'], 'size':16})
#mpl.rcParams['legend.fontsize'] = 10

fig = plt.figure()
ax = fig.gca(projection='3d')
for index, i in enumerate(sys.argv[1:]):
    data = np.loadtxt(i, skiprows=1, usecols=(0,1))
    z = np.linspace(0, len(data), len(data))
    ax.plot(z, data[:,0], data[:,1], label=i, linestyle='--', marker='+')
ax.set_xlabel('Time')
ax.set_ylabel('x position')
ax.set_zlabel('y position')
ax.legend()

#ax.view_init(elev=18,azim=-45)
#fig.tight_layout()
plt.show()