Pip 正在回滚安装工具的卸载

Question

我正在使用 this Ansible-Django 堆栈将我的 Django 项目部署到 AWS EC2 实例。好久没问题了，现在部署的时候突然报下面的错误

似乎有一个新的 setuptools 版本没有正确更新。

为什么会回滚 setuptools 的卸载？
为什么不安装setuptools 36.2.2？

在我的要求中明确指定 setuptools 的版本解决了这个问题，但由于我只是间接依赖 setuptools，所以我没有责任知道要保留哪个版本。

Installing collected packages: shared-django, setuptools
  Found existing installation: shared-django 0.1.0
    Uninstalling shared-django-0.1.0:
      Successfully uninstalled shared-django-0.1.0
  Running setup.py install for shared-django: started
    Running setup.py install for shared-django: finished with status 'done'
  Found existing installation: setuptools 36.2.0
    Uninstalling setuptools-36.2.0:
      Successfully uninstalled setuptools-36.2.0
  Rolling back uninstall of setuptools

:stderr: Exception:
Traceback (most recent call last):
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/basecommand.py\", line 215, in main
    status = self.run(options, args)
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/commands/install.py\", line 342, in run
    prefix=options.prefix_path,
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/req/req_set.py\", line 784, in install
    **kwargs
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/req/req_install.py\", line 851, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/req/req_install.py\", line 1064, in move_wheel_files
    isolated=self.isolated,
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/wheel.py\", line 247, in move_wheel_files
    prefix=prefix,
  File \"/webapps/CatalogService/lib/python3.5/site-packages/pip/locations.py\", line 140, in distutils_scheme
    d = Distribution(dist_args)
  File \"/webapps/CatalogService/lib/python3.5/site-packages/setuptools/dist.py\", line 365, in __init__
    self._finalize_requires()
  File \"/webapps/CatalogService/lib/python3.5/site-packages/setuptools/dist.py\", line 372, in _finalize_requires
    if not self.install_requires:
AttributeError: 'Distribution' object has no attribute 'install_requires'

Answer 1

我不得不通过 ssh 进入服务器并且运行

python -m pip install --upgrade -vv setuptools

然后我再次部署并且成功了。

Pip 正在回滚安装工具的卸载

Pip is rolling back uninstall of setuptools

python

django

pip

setuptools

ansible