python 3.x – bs4.FeatureNotFound (error in BeaultifullSoup and parser)

I need to extract all the text from an HTML file. I decided to take a look at BeaultiSoup to see how I did it to him. But he started showing the text at the beginning and the code:
`import requests
from bs4 import BeautifulSoup

url = & # 39; http: // acao = p & opcao = 1 & txt = & # 39;
r = requests.get (url)
print (r.text)

soup = BeautifulSoup (r.text, & lxml;)
list = soup.find_all ('table', class _ = & # 39; textm & # 39;)
print (list)

The error that he gives is Traceback (most recent call last):
File "C: /Users/Ariane/PycharmProjects/extracao/", line 9, in
soup = BeautifulSoup (r.text, & lxml;)
File "C: Users Ariane PycharmProjects extraction venv lib sites-packages bs4 __", line 196, in __init__
% ",". join (features))
bs4.FeatureNotFound: Can not find a tree generator with the requested features: lxml. Do you need to install an analyzer library?

I did the installation of LXML and switch it to "html.parse", but the error remains the same. Can someone help?