How to use CSS Selectors in Python?

Python has several popular packages that can parse HTML using CSS selectors.
The most popular one is BeautifulSoup which can execute CSS selectors through the select() and select_one() methods:

from bs4 import BeautifulSoup

soup = BeautifulSoup("""
<a>link 1</a>
<a>link 2</a>
""")

print(soup.select_one('a'))
"<a>link 1</a>"
print(soup.select('a'))
["<a>link 1</a>", "<a>link 2</a>"]

Another popular package is parsel (also used by scrapy) which can execute CSS selectors through the css() method:

from parsel import Selector

soup = Selector("""
<a>link 1</a>
<a>link 2</a>
""")

print(soup.css('a').get())
"<a>link 1</a>"
print(soup.css('a').getall())
["<a>link 1</a>", "<a>link 2</a>"]