Please help me translate matlab to python

[Chriskim]

Hi,
I am trying to translate a simple program that was written in matlab to python.

I uses arrays to plot multiple data in single graph.
I wrote the python according to the matlab language.
But is seems like i made some mistake along the way.

Please help me
Thank you in advance

This is matlab code that actually works

subplot(5,4,1) 
a=0.02; b=0.2;  c=-65;  d=6;
V=-70;  u=b*V;
VV=[];  uu=[];
tau = 0.25; tspan = 0:tau:100;
T1=tspan(end)/10;
for t=tspan
    if (t>T1) 
        I=14;
    else
        I=0;
    end;
    V = V + tau*(0.04*V^2+5*V+140-u+I);
    u = u + tau*a*(b*V-u);
    if V > 30
        VV(end+1)=30;
        V = c;
        u = u + d;
    else
        VV(end+1)=V;
    end;
    uu(end+1)=u;
end;
plot(tspan,VV,[0 T1 T1 max(tspan)],-90+[0 0 10 10]);
axis([0 max(tspan) -90 30])
axis off;
title('(A) tonic spiking');

This is my python code.

import sys
from math import *
from scipy.integrate import odeint # ODE integration
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import numpy
import pylab

a = 0.02
b = 0.2
c = -65
d = 6
V = -70
u = b * V
VV = []
uu = []
tau = 0.25
tspan = numpy.arange(0,101,tau)
T1 = tspan(-1)/10

for t in tspan:
    if t>T1:
        I = 14
    else: 
        I = 0
    V = V + tau*(0.04*V^2+5*V+140-u+I)
    u = u + tau*a*(b*V-u)
    if V>30:
        VV[end+1]=30
        V = c
        u = u + d
    else:
        VV[end+1] = V
    uu[end+1] = u
pylab.plot(tspan,VV)
pylab.show()