x = ['北京', '上海', '广州', '深圳', '杭州', '成都', '武汉', '南京', '西安', '厦门']
y = [20000, 19800, 17000, 17000, 15000, 10000, 10000, 9800, 7000, 8000]
plt.figure(figsize=(8, 6), dpi=70)
for i in range(len(x)):
    plt.bar(x[i], y[i], color = plt.cm.tab20(i/10))
    
for i in list(zip(x, y)):
    plt.text(i[0], i[1]+300, i[1], horizontalalignment='center')
plt.show();