matplotlib - how to plot binomial tree with arrays in python

Question

I have a two tridiagonal matrix that (with equal dimensions) and want to plot it like the binomial tree in the picture below in python.

Binomial tree

here is my code :

stockPrice = 100; u = 1.2; d = 0.8; n = 5; k=80; r = 0.1; prob = 0.5;

for i in range(n):
    for j in range(n):
        if i==j:
            if i==0:
                s[i,j] = stockprice
            else:
                s[i,j] = s[i-1,j-1]*d
        if j>i:
            s[i,j] = s[i,j-1]*u

for i in range(n):
    for j in range(n):
        if putcall =='c':
            payoff[i,j] = max(s[i,j]-k,0)
        elif putcall=='p':
            payoff[i,j] = max(k-s[i,j],0)

for i in range(n-1):
    for j in range(n-1):
        if putcall=='c':
            f[i,j] = (prob*payoff[i,j+1] + (1-prob)*payoff[i+1,j+1])*np.exp(-r*t)
        elif putcall=='p':
            f[i,j] = (prob*payoff[i,j+1] + (1-prob)*payoff[i+1,j+1])*np.exp(-r*t)

Answer 1

等待大神答复