Plot f:R->R^2 python 2.7

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Python

I need to plot a continous flow of data coming from the serial. Data has 2 dimensions, let's say X and Y. I would like to plot these data against a third dimension, the time flowing. I wrote this code, but it doesn't do what i want.

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import mpl_toolkits.mplot3d.axes3d as p3
import numpy.random as rnd
import numpy as np

TILL = 200 # just to have an end in the for loop

def func(t):
	X = np.sin(t)
	Y = np.cos(t)
	T = t
	return X,Y,T

t = range(0,200)

plt.ion()
fig = plt.figure()
ax = fig.gca(projection='3d')
X,Y,T = func(t)
g, = ax.plot(X,Y,T)

plt.ylim([-1.5,1.5])
plt.xlim([-1.5,1.5])

for i in range(TILL):
	val = rnd.random(1)
	t.append(val)
	t.pop(0)
	X,Y,T = func(t)
	g.set_data(X,Y)
    ax.set_zlim(i,i+100)
    plt.draw()

It's as the problem of plotting a function from R to R square with sliding temporal axis.

Any help would be appreciate.
Thanks