柱状图颜色区分

import matplotlib.pyplot as plt 
import numpy as np
np.random.seed(0) 
x = np.arange(5)
y = np.random.randint(-5,5,5)
v_bar = plt.bar(x,y,color='blue')

#对y值大于0设置为蓝色，小于0的柱设置为绿色
for bar,height in zip(v_bar,y):
    if height<0:
        bar.set(color='green')
    
plt.show()