import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

plt.rcParams['font.sans-serif']=['SimSun']


# 示例数据
data = {
    'date': pd.date_range(start='2024-03-01', periods=40),
    'value': range(40)
}

df = pd.DataFrame(data)
start_date = '2024-03-03'
start_date = pd.to_datetime(start_date)
df['date'] = pd.to_datetime(df['date'])
df = df[(df['date'] >= start_date) & (df['date'] <= '2024-03-31')]
df['days_from_start'] = (df['date'] - start_date).dt.days
df['group'] = df['days_from_start'] // 7
df = df.reset_index()
df2 = df.groupby(['group']).agg({'value':np.sum}).reset_index()

xargs = df2['group'] + 1
yargs = df2['value']

start_title = df.iloc[0]['date'].strftime('%Y-%m-%d')
end_title = df.iloc[df.index.max()]['date'].strftime('%Y-%m-%d')
plt.figure(figsize=(5,8))
ax = plt.gca()
ax.set_xlabel('第X周')
ax.set_ylabel('工单数量')
ax.set_title('工单统计:{}至{}'.format(start_title,end_title))
plt.bar(xargs,yargs,width=0.5 ,align='center',color='skyblue', alpha=0.7)
for i,count in enumerate(yargs):
    plt.text(i+1,count,str(count),va='bottom',ha='center',fontsize =10)
plt.tight_layout()
plt.show()

效果图：

Figure_2.png