python报错bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml.【已解】

1.遇到的问题

2.项目代码

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @FileName  :BeautifulSoupDemo.py
# @Time      :2020/3/8 12:26
# @Author    :青松

# coding=utf-8


from bs4 import BeautifulSoup

html = '''


The Dormouse's story

Once upon a time there were three little sisters; and their names were
Elsie,
Lacie and
Tillie;
and they lived at the bottom of a well.
...
'''
soup = BeautifulSoup(html,'lxml')
print(soup.prettify())
print(soup.title)
print(soup.title.name)
print(soup.title.string)
print(soup.title.parent.name)
print(soup.p)
print(soup.p["class"])
print(soup.a)
print(soup.find_all('a'))
print(soup.find(id='link3'))

3.该项目无法正常执行

4.修改配置，问题解决

注意：我使用的是Anaconda3，所有库都是集成一体的。如果是单独的python环境，需要利用pip3命令手动安装，问题一样可以解决

5.运行结果