BeautifulSoup报错：UserWarning: No parser was explicitly specified

完整报错如下：

UserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("html5lib"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.

报错代码如下：

bs = BeautifulSoup(response.text) 

说明：python在使用BeautifulSoup的时候，运行没有问题，但是会提示No parser was explicitly specified。在百度上查了一下，发现是BeautifulSoup运行的时候没有指定的解释器，默认使用了html5lib。

解决办法：

1、先使用pip install 安装html5lib

pip install html5lib

2、在报错代码里添加"html5lib"

修改后的代码如下：

bs = BeautifulSoup(response.text, "html5lib")