在每月的最后一天创建日期序列

from datetime import datetime, timedelta

def generate_last_day_of_month(start_date, end_date):
    date_list = []
    current_date = start_date
    while current_date <= end_date:
        # 找到当前月的最后一天
        if current_date.month == 12:
            next_month = current_date.replace(year=current_date.year + 1, month=1)
        else:
            next_month = current_date.replace(month=current_date.month + 1)
        last_day_of_month = next_month - timedelta(days=1)
        
        date_list.append(last_day_of_month)
        current_date = last_day_of_month + timedelta(days=1)
    
    return date_list

# 示例使用
start_date = datetime(2023, 1, 1)
end_date = datetime(2023, 12, 31)
last_days = generate_last_day_of_month(start_date, end_date)
for day in last_days:
    print(day.strftime("%Y-%m-%d"))