生成年的第几周 python python生成日期

import datetime
 
def create_assist_date(datestart = None,dateend = None):
    # 创建日期辅助表
    if datestart is None:
        datestart = '2022-04-25'
    if dateend is None:
        dateend = datetime.datetime.now().strftime('%Y-%m-%d')
 
    # 转为日期格式
    datestart=datetime.datetime.strptime(datestart,'%Y-%m-%d')
    dateend=datetime.datetime.strptime(dateend,'%Y-%m-%d')
    date_list = []
    date_list.append(datestart.strftime('%Y-%m-%d'))
    while datestart<dateend:
        # 日期叠加一天
        datestart+=datetime.timedelta(days=+1)
        # 日期转字符串存入列表
        date_list.append(datestart.strftime('%Y-%m-%d'))
    print(date_list)
 
 
if __name__ == '__main__':
    create_assist_date()