如何获取天数。数据类型错误。Python

from datetime import datetime

def get_days(start_date, end_date):
    try:
        # 将日期字符串转换为datetime对象
        start_date = datetime.strptime(start_date, "%Y-%m-%d")
        end_date = datetime.strptime(end_date, "%Y-%m-%d")
        
        # 计算日期之间的差值
        delta = end_date - start_date
        
        # 获取天数
        days = delta.days
        
        return days
    except ValueError:
        return "日期格式错误，请使用YYYY-MM-DD格式"

# 示例用法
start_date = "2022-01-01"
end_date = "2022-01-10"
days = get_days(start_date, end_date)
print("天数：", days)