python画直方图小结

# -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
#显示中文
plt.rcParams['font.family']=['sans-serif']
plt.rcParams['font.sans-serif']=['SimHei']

x=[2017, 2018, 2019, 2020]
y=[2.0772,2.942,3.2828,3.3773]

#color可用16进制，zorder使参考线不覆盖直方图，类似图层
plt.bar(x, y, label='graph 1',color='#1F53B4FF',zorder=10)

#设置想要的坐标轴显示
plt.xticks(x, x, rotation=0) 

#设置y轴的数值显示范围。
plt.ylim(0, 4)

#axis只横向；alpha透明度；zorder图层，于上方对应
plt.grid(axis='y', alpha=0.5,color='#9EA4ADFF',zorder=0)

#使labei生效
plt.legend()

#在直方块上加文字
plt.text(2017, 2.2, '2.0772', fontsize=12, c='black',verticalalignment='center',horizontalalignment='center',rotation=0)
plt.text(2018, 3.1, '2.942', fontsize=12, c='black',verticalalignment='center',horizontalalignment='center',rotation=0)
plt.text(2019, 3.4, '3.2828', fontsize=12, c='black',verticalalignment='center',horizontalalignment='center',rotation=0)
plt.text(2020, 3.5, '3.3773', fontsize=12, c='black',verticalalignment='center',horizontalalignment='center',rotation=0)

plt.xlabel('年份')
plt.ylabel('单位：亿元')

plt.title(u'2027-2020年中国共享经济市场交易规模统计情况')

plt.show()
# plt.savefig("./2027-2020年中国共享经济市场交易规模统计情况.png")