python爬虫问题-BeautifulSoup库运行提示GuessedAtParserWarning: No parser was explicitly specified

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• 问题描述
• 问题代码
• 运行结果
• 解决方案
• 运行效果
• 总结

1. python版本: python-3.8.1-amd64
2. python开发工具: JetBrains PyCharm 2018.3.6 x64
3. 安装BeautifulSoup库(指定阿里镜像安装会很快)
   pip install beautifulsoup4 -i http://mirrors.aliyun.com/pypi/simple/

GuessedAtParserWarning: No parser was explicitly specified, so I’m using the best available HTML parser for this system (“html.parser”). 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.

from urllib.request import urlopen
from bs4 import BeautifulSoup

html = urlopen("https://www.baidu.com/s?wd=python%E7%88%AC%E8%99%AB%E4%B9%A6%E7%B1%8D")
bsObj = BeautifulSoup(html.read())
print(bsObj.head)

GuessedAtParserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("html.parser"). 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.

The code that caused this warning is on line 5 of the file To get rid of this warning, pass the additional argument 'features="html.parser"' to the BeautifulSoup constructor.

  bsObj = BeautifulSoup(html.read())

from urllib.request import urlopen
from bs4 import BeautifulSoup

html = urlopen("https://www.baidu.com/s?wd=python%E7%88%AC%E8%99%AB%E4%B9%A6%E7%B1%8D")
# 在调用的BeautifulSoup指定html.parser即可
bsObj = BeautifulSoup(html.read(), 'html.parser')
print(bsObj.head)

提示信息:未明确指定解析器，因此我正在为此系统使用最佳的HTML解析器（“ html.parser”）,在调用BeautifulSoup指定html.parser即可