找不到具有您请求的功能的树生成器：xml

Posted 2023-02-23

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【中文标题】找不到具有您请求的功能的树生成器：xml【英文标题】：Couldn't find a tree builder with the features you requested: xml 【发布时间】：2019-11-07 06:34:57 【问题描述】：

我安装了 anaconda，下面是在 jupyter notebook 中完美运行的代码。

from bs4 import BeautifulSoup as bs

xml = '<head><body></body></head>'
s = bs(xml,'xml')
print(s)

输出：

<?xml version="1.0" encoding="utf-8"?>
<Head><body/></Head>

但如果我尝试使用 windows 命令提示符运行相同的代码，则会引发以下错误：

F:\ProgramData\Anaconda3>python testcode.py Traceback（最近最后调用）：文件“testcode.py”，第 4 行，在 s = bs(xml,'xml') 文件“F:\ProgramData\Anaconda3\lib\site-packages\bs4__init__.py”，行 198，在初始化 % ",".join(features)) bs4.FeatureNotFound：找不到具有您请求的功能的树构建器 d：xml。是否需要安装解析器库？

我什至尝试将脚本复制到“F:\ProgramData\Anaconda3”文件夹并从这里运行命令提示符。但同样的错误。

注意：F: 是操作系统驱动器。

我该如何解决这个问题？

运行 python 脚本的根目录（在 anaconda windows 上）应该是什么，以便它可以找到 conda 包？

关于从该位置运行 python 控制台的一些观察：

F:\ProgramData\Anaconda3>python
Python 3.7.0 (default, Jun 28 2018, 08:04:48) [MSC v.1912 64 bit (AMD64)] :: Ana
conda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import xml
>>> from bs4 import BeautifulSoup as bs
>>> s = bs("<head></head>","xml")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "F:\ProgramData\Anaconda3\lib\site-packages\bs4\__init__.py", line 198, i
n __init__
    % ",".join(features))
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requeste
d: xml. Do you need to install a parser library?
>>> import lxml
>>> s = bs("<head></head>","lxml")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "F:\ProgramData\Anaconda3\lib\site-packages\bs4\__init__.py", line 198, i
n __init__
    % ",".join(features))
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requeste
d: lxml. Do you need to install a parser library?
>>>