from random import random

import matplotlib.pyplot as plt
plt.style.use('ggplot')

stake = base_stake = 10
balance = 2000
balance_history = []
tries = 10000

for _ in range(tries):
    if random() < (0.5 + 2/38):  # 2/38 represents zero plus double zero
        balance -= stake
        stake *= 2
    else:
        balance += stake
        stake = base_stake

    balance_history.append(balance)

plt.figure(figsize=(15, 4))
plt.plot(balance_history)
plt.ylabel('Balance'); plt.xlabel('# of roll');
plt.show()