当安装了与旧版本链接的软件包时，安装新版本的Python [英] Install a newer Python when there are installed packages linked against the old one
问题描述
（请耐心等待，这里有很长的描述，这是一个相当麻烦的故障排除过程。）
(Please bear with me for the long description, it has been quite a troubleshooting journey.)
我的最终目标是python软件包 graph_tool 在我的系统上也可以在ipynb上运行。我已经
brew安装图形工具，如此处指示，但这仍然不够。
My ultimate goal is to get python package graph_tool working on my system and also on ipynb if possible. I have already brew install graph-tool, as indicated here, but that's still insufficient.
所以我遵循 conda说明，并尝试满足所有要求，包括拥有 cgal 和 python3.6 。我最初有一个带有python2.7和python3.5的anaconda，但是由于python3.6是必需的，所以我下载了带有python3.6的anaconda3。 （ conda更新python 仍然不断给我3.5）
So I follow conda instructions here, and try to fulfill all requirements including having cgal and python3.6. I had anaconda with python2.7 and python3.5 originally, but since python3.6 is necessary, I download anaconda3 with python3.6. (conda update python still kept giving me 3.5)
我删除了/ Users / mymacbook / anaconda，因此/ Users / mymacbook / anaconda3将是默认的搜索目录。而且我有一个小小的成功！
I delete /Users/mymacbook/anaconda, so that /Users/mymacbook/anaconda3 would the default search directory. And I have a mini-success!
$ python3
Python 3.6.2 |Anaconda, Inc.| (default, Sep 21 2017, 18:29:43)
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
不幸的是，由于我继续 conda安装其他所需的软件包（boost，cgal等），我的python3恢复为3.5：（
Unfortunately, as I continue to conda install the other packages required (boost, cgal, etc), my python3 is reverted back to 3.5 :(
$ python3
Python 3.5.4 |Anaconda custom (x86_64)| (default, Oct 5 2017, 02:58:14)
$ conda install python=3.6
Fetching package metadata ...........
Solving package specifications: .
UnsatisfiableError: The following specifications were found to be in conflict:
- cgal -> python 3.5*
- python 3.6*
Use "conda info <package>" to see the dependencies for each package.
$ conda info cgal
Fetching package metadata ...........
ResolvePackageNotFound:
- cgal
确实是个泡菜。。。建议使用ResolvePackageNotFound卸载cgal，但是正如我提到的，我同时需要cgal和python3.6 。
Quite a pickle isn't it... A recommendation was to uninstall cgal due to ResolvePackageNotFound, but like I mentioned, I need both cgal and python3.6.
预先感谢帮助！ （并且请在您的建议中加入适用的命令行-我是初学者）
Thanks in advance for the help! (and please include applicable command lines with your suggestions - I'm a beginner)
推荐答案
您的 cgal 的已安装副本是针对Python 3.5编译的。如果您查看 https://anaconda.org/conda-forge/cgal/files，每个Python次要版本都有一个单独的软件包。
Your installed copy of cgal is compiled for Python 3.5. If you look at https://anaconda.org/conda-forge/cgal/files , there's is a separate package for each Python minor version.
- 安装新Python一个新的环境（如果您不想替换现有的安装），或者
-
更新'（与其他软件包一起使用）需要）如果您确实要替换当前的软件包
- installing a new Python to a new environment if you don't want to replace an existing installation, or
update'ing it (together with other packages if needed) if you do want to replace the current one
当然，您可以卸载所有特定于版本的软件包，安装新的Python，然后重新安装软件包-但这需要更多工作。
Of course, you can instead uninstall all version-specific packages, install the new Python, then reinstall the packages - but that's more work.
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