python绘制条形图如何使x轴带上数字

Question

用的matplotlib，x轴上是年份，如何使2019，2020等后面能带上“年”

Answer 1

import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import datetime

# 示例数据
dates = [
    datetime.datetime(2020, 1, 1),
    datetime.datetime(2020, 2, 1),
    datetime.datetime(2020, 3, 1),
    datetime.datetime(2020, 4, 1),
    datetime.datetime(2020, 5, 1)
]
values = [5, 3, 8, 4, 2]

# 转换日期数据
x = mdates.date2num(dates)

# 创建图表
fig, ax = plt.subplots()

# 设置x轴刻度格式
plt.rcParams['font.sans-serif'] = ['SimHei']
date_format = mdates.DateFormatter('%Y年')
ax.xaxis.set_major_formatter(date_format)

# 绘制图表
ax.plot(x, values)

# 显示图表
plt.show()