python——ModuleNotFoundError: No module named ‘bs4‘

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本文详细介绍了如何在Python环境中安装bs4模块，包括解决安装过程中遇到的问题，如版本更新等。bs4模块，即BeautifulSoup4，是一个用于解析HTML和XML文件的库，能帮助开发者快速提取网页数据。

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报错原因是没有安装bs4模块

什么是bs4模块？

Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式.Beautiful Soup会帮你节省数小时甚至数天的工作时间.

解决：

可以直接在命令窗口安装，通过命令

C:\Users\徐文涛>pip install beautifulsoup4
Collecting beautifulsoup4
  Downloading https://files.pythonhosted.org/packages/66/25/ff030e2437265616a1e9b25ccc864e0371a0bc3adb7c5a404fd661c6f4f6/beautifulsoup4-4.9.1-py3-none-any.whl (115kB)
     |████████████████████████████████| 122kB 14kB/s
Collecting soupsieve>1.2 (from beautifulsoup4)
  Downloading https://files.pythonhosted.org/packages/6f/8f/457f4a5390eeae1cc3aeab89deb7724c965be841ffca6cfca9197482e470/soupsieve-2.0.1-py3-none-any.whl
Installing collected packages: soupsieve, beautifulsoup4
Successfully installed beautifulsoup4-4.9.1 soupsieve-2.0.1
WARNING: You are using pip version 19.2.3, however version 20.2.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

C:\Users\徐文涛>python -m pip install --upgrade pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/5a/4a/39400ff9b36e719bdf8f31c99fe1fa7842a42fa77432e584f707a5080063/pip-20.2.2-py2.py3-none-any.whl (1.5MB)
     |████████████████████████████████| 1.5MB 10kB/s
Installing collected packages: pip
  Found existing installation: pip 19.2.3
    Uninstalling pip-19.2.3:
      Successfully uninstalled pip-19.2.3
Successfully installed pip-20.2.2

我安装时提示有新版本可用，根据提示升级了一下