用年份绘制pandas数据帧

import pandas as pd
import matplotlib.pyplot as plt

data = {'date': ['2022-01-01', '2022-02-01', '2022-03-01', '2023-01-01', '2023-02-01'],
        'value': [10, 20, 30, 40, 50]}
df = pd.DataFrame(data)

df['date'] = pd.to_datetime(df['date'])

df['year'] = df['date'].dt.year

df_yearly = df.groupby('year')['value'].sum()  # 或者使用.mean()计算平均值

df_yearly.plot(kind='bar')
plt.xlabel('Year')
plt.ylabel('Value')
plt.title('Yearly Data')
plt.show()