爬虫异常处理-阿里云

7、web爬虫讲解2—urllib库爬虫—状态吗—异常处理—浏览器伪装技术、设置用户代理

如果爬虫没有异常处理，那么爬行中一旦出现错误，程序将崩溃停止工作，有异常处理即使出现错误也能继续执行下去 1.常见状态码 301：重定向到新的URL，永久性302：重定向到临时URL，非永久性304：请求的资源未更新400：非法请求401：请求未经授权403：禁止访问404：没找到对应页面500：服...

3.爬虫异常处理——状态码

#python爬虫的异常处理 #爬虫遇到异常时就会直接崩溃停止运行，下次再运行时，又会从头开始。 #开发一个具有顽强生命力的爬虫，必须要进行异常处理。 #常见状态码以及含义 #301 Moved Permanently：重定向到新的URL，永久性 #302 Found：重定向到临时的URL，非永久性...

Python爬虫实战

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Python爬虫day3.2—python异常处理

异常处理概述 python程序在执行的时候，经常会遇到异常，如果中间异常不处理，经常会导致程序崩溃。比如爬虫，如果不进行异常处理，很可能虫爬了一半，直接崩溃了。 #异常处理 for i in range(0,10): print(i) if(i==4): print(iuuuu) 代码运行异常异常...

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