问题描述
我正在尝试使用$ brew upgrade python从“ Python 3.7.3”升级到“ Python 3.8”。但是当我尝试时，brew返回：
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
Updated 2 formulae.
Error: python not installed
我知道已经安装了python，因为我已经使用了几个月了。我可以通过运行which python3
/usr/bin/python3
还有python3 --version，
Python 3.7.3
我不知道是什么原因造成的？
问题可能是python --version仍指向python2 Python 2.7.16。
更新
我还确认我已经运行过brew cleanup和brew doctor。
brew info python返回
[email protected]: stable 3.8.5 (bottled)
Interpreted,interactive,object-oriented programming language
https://www.python.org/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/[email protected]
License: Python-2.0
==> Dependencies
Build: pkg-config ✔
required: gdbm ✔,[email protected] ✔,readline ✔,sqlite ✔,xz ✔
==> 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/[email protected]/libexec/bin
You can install Python packages with
pip3 install <package>
They will install into the site-package directory
/usr/local/lib/python3.8/site-packages
See: https://docs.brew.sh/Homebrew-and-Python
==> Analytics
install: 587,815 (30 days),1,615,984 (90 days),2,710,078 (365 days)
install-on-request: 187,760 (30 days),307,168 (90 days),343,355 (365 days)
build-error: 0 (30 days)
解决方法
解决方案是使用brew安装python。
brew install python
我认为它已经安装了，但这是系统版本（不是brew）。
错误Error: python not installed暗示brew尚未安装python。