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前言

使用环境：
python 3.8
django 2.1.2
celery 3.1.26.post2

celery 版本安装

在安装celery版本 的时候报错No matching distribution found for anyjson>=0.3.3

Requirement already satisfied: kombu<3.1,>=3.0.37 in d:\django38\hrun2_web\venv\lib\site-packages (from
 celery==3.1.26.post2) (3.0.37)
Collecting anyjson>=0.3.3
  Using cached anyjson-0.3.3.tar.gz (8.3 kB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      error in anyjson setup command: use_2to3 is invalid.
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

出现报错是安装anyjson>=0.3.3失败了。
具体原因是 setuptools从版本58.0.0开始不再支持2to3的builds，所以导致 anyjson 安装后不再可用。
解决问题办法，降级 setuptools 工具版本即可。

降级 setuptools

先查看当前安装的 setuptools 工具版本号Version: 61.3.1

>pip show setuptools
Name: setuptools
Version: 61.3.1
Summary: Easily download, build, install, upgrade, and uninstall Python packages
Home-page: https://github.com/pypa/setuptools
Author: Python Packaging Authority
Author-email: distutils-sig@python.org
License: UNKNOWN
Location: d:\django38\hrun2_web\venv\lib\site-packages
Requires:
Required-by: jsonschema

降级版本

>pip install --upgrade setuptools==57.5.0

接着就可以成功安装celery==3.1.26.post2

>pip install celery==3.1.26.post2

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