BeautifulSoup警告: BeautifulSoup([your markup], "html.parser")

from urllib.request import urlopen
from bs4 import BeautifulSoup


html = urlopen("http://www.pythonscraping.com/pages/page1.html")
bsObj = BeautifulSoup(html.read())
print(bsObj.h1)

/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 /Users/jiangxiaohan/Desktop/PythonDemo/beautifulSoupDemo/beautifulSoupTest1.py
/Users/jiangxiaohan/Library/Python/3.6/lib/python/site-packages/bs4/__init__.py:181: UserWarning: 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 6 of the file /Users/jiangxiaohan/Desktop/PythonDemo/beautifulSoupDemo/beautifulSoupTest1.py. To get rid of this warning, change code that looks like this:

 BeautifulSoup([your markup])

to this:

 BeautifulSoup([your markup], "html.parser")

  markup_type=markup_type))
<h1>An Interesting Title</h1>

Process finished with exit code 0

BeautifulSoup(html.read(), "html.parser")