Python 3 从计算机上消失了 - MacOS

Question

我在 OS Mojave 上，刚刚使用自制软件安装 geos 和 proj，python3 消失了。我有两个版本，现在我只有 2.7 版本。我做了 brew install python3，它说它已经安装但没有链接，然后我按照它的建议做了 brew link python，但它返回了一个 Error: Could not symlink Frameworks/Python.framework/Headers Target /usr/local/Frameworks/Python.framework/Headers is a symlink belonging to python@2.。

我怎样才能回到拥有两个版本的状态？。我不是 100% 安装 geos，proj 是造成它的原因，但我 3 天前使用了 python3。自上次使用 python3.

以来，我还通过自制软件安装了 phantomjs

我需要安装 python 的两个版本。由于我的计算机上似乎还有所有文件，因此处理此问题的适当方法是什么？

提前致谢！

Answer 1

安装虚拟环境，以便您可以使用许多不同版本的 Python。

Answer 2

使用 anaconda python 更适合 python 的发行版。

Answer 3

使用$ type python查看它指向的位置。使用 brew info 命令列出已安装 python 的信息。

$ brew info python
python: stable 3.7.6 (bottled), HEAD
Interpreted, interactive, object-oriented programming language
https://www.python.org/
/usr/local/Cellar/python/3.7.5 (4,032 files, 61.8MB) *
  Poured from bottle on 2019-11-04 at 22:34:01
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/python.rb
==> Dependencies
Build: pkg-config ✔
Required: gdbm ✔, openssl@1.1 ✔, readline ✔, sqlite ✔, xz ✔
==> Options
--HEAD
    Install HEAD version
==> Caveats
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin

If you need Homebrew's Python 2.7 run
  brew install python@2

You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python

查看 Caveats

下的行

Python has been installed as
/usr/local/bin/python3

那是您的 python3 别名路径。您可以安全地符号链接 python 以在 ~/.bash_profile

中指向它

$ echo 'alias python=/usr/local/bin/python' > ~/.bash_profile
$ cat ~/.bash_profile
###########################
# you'll probably see these kind of lines before your alias
###########################

export PATH=/usr/local/bin:/usr/local/Cellar:$PATH
export ARCHFLAGS="-arch x86_64"
export LC_ALL="en_US.UTF-8"
export LANG="en_US.UTF-8"
alias python=/usr/local/bin/python

重启终端使其生效

$ type python
python is aliased to `python3'
$ python
Python 3.7.5 (default, Nov  1 2019, 02:16:32) 
[Clang 11.0.0 (clang-1100.0.33.8)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

Python 3 从计算机上消失了 - MacOS

Python 3 disappeared from computer - MacOS

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