python">import pandas as pd
import numpy as np# 定义时间范围
date_range = pd.date_range(start='2023-11-01', end='2024-10-31', freq='M'
python">import pandas as pd
import numpy as np# 定义时间范围
date_range = pd.date_range(start='2023-11-01', end='2024-10-31', freq='M'