python条形图 python使用Matplotlib画条形图

# encoding:utf-8
import matplotlib.pyplot as plt
# 构建数据
GDP = [12406.8,13908.57,9386.87,9143.64]
 
# 中文乱码的处理
plt.rcParams['font.sans-serif'] =['Microsoft YaHei']
plt.rcParams['axes.unicode_minus'] = False
 
# 绘图
plt.bar(range(4), GDP, align = 'center',color='steelblue', alpha = 0.8)
# 添加轴标签
plt.ylabel('GDP')
# 添加标题
plt.title('Comparing about four cities GDP')
# 添加刻度标签
plt.xticks(range(4),['Beijing','Shanghai','Tianjin','Chongqing'])
# 设置Y轴的刻度范围
plt.ylim([5000,15000])
 
# 为每个条形图添加数值标签
for x,y in enumerate(GDP):
 plt.text(x,y+100,'%s' %round(y,1),ha='center')# 显示图形plt.show()
plt.show()