[{"createTime":1735734952000,"id":1,"img":"hwy_ms_500_252.jpeg","link":"https://activity.huaweicloud.com/cps.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=V1g3MDY4NTY=&utm_medium=cps&utm_campaign=201905","name":"华为云秒杀","status":9,"txt":"华为云38元秒杀","type":1,"updateTime":1735747411000,"userId":3},{"createTime":1736173885000,"id":2,"img":"txy_480_300.png","link":"https://cloud.tencent.com/act/cps/redirect?redirect=1077&cps_key=edb15096bfff75effaaa8c8bb66138bd&from=console","name":"腾讯云秒杀","status":9,"txt":"腾讯云限量秒杀","type":1,"updateTime":1736173885000,"userId":3},{"createTime":1736177492000,"id":3,"img":"aly_251_140.png","link":"https://www.aliyun.com/minisite/goods?userCode=pwp8kmv3","memo":"","name":"阿里云","status":9,"txt":"阿里云2折起","type":1,"updateTime":1736177492000,"userId":3},{"createTime":1735660800000,"id":4,"img":"vultr_560_300.png","link":"https://www.vultr.com/?ref=9603742-8H","name":"Vultr","status":9,"txt":"Vultr送$100","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":5,"img":"jdy_663_320.jpg","link":"https://3.cn/2ay1-e5t","name":"京东云","status":9,"txt":"京东云特惠专区","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":6,"img":"new_ads.png","link":"https://www.iodraw.com/ads","name":"发布广告","status":9,"txt":"发布广告","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":7,"img":"yun_910_50.png","link":"https://activity.huaweicloud.com/discount_area_v5/index.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=aXhpYW95YW5nOA===&utm_medium=cps&utm_campaign=201905","name":"底部","status":9,"txt":"高性能云服务器2折起","type":2,"updateTime":1735660800000,"userId":3}]
要将一个字符串转成数字，可以使用以下方法：
* 使用 int() 函数将字符串转换为整数
示例代码：
str_num = "123" num = int(str_num) print(num) # 输出：123
需要注意的是，如果字符串无法转换成数字，会引发 ValueError 异常。比如：
str_num = "abc" num = int(str_num) # 将会抛出 ValueError 异常
* 使用 float() 函数将字符串转换为浮点数
示例代码：
str_num = "3.14" num = float(str_num) print(num) # 输出：3.14
同样地，如果字符串无法转换成数字，也会引发 ValueError 异常
注意，在一些极端情况下，因运算误差， float 转换并不能精确地得到字符串表示的数字。
* 使用 eval() 函数求值表达式
eval() 函数可以求解包含数字和运算符的字符串表达式，并返回计算结果。
示例代码：
str_exp = "2 + 3 * 4" result = eval(str_exp) print(result) # 输出 14
需要注意的是，eval() 函数的参数可能包含恶意代码，特别是在接收用户输入的情况下，应当格外小心，以避免安全问题。
