无法使用 Homebrew Python 在 Mac 上升级 pip3

Question

我在 mac 上升级 pip3 失败，并且在终端中得到了令人困惑的（对我而言）答案：

> which python
/usr/bin/python

> pip -V
pip 9.0.1 from /Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg (python 2.7)

> which python3
/usr/local/bin/python3

> python3 -V
Python 3.6.4

> pip3 -V
pip 7.1.0 from /usr/local/lib/python3.6/site-packages (python 3.6)

> sudo -H pip3 install --upgrade pip
You are using pip version 7.1.0, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Requirement already up-to-date: pip in /usr/local/lib/python3.6/site-packages

> sudo -H pip3 install --upgrade pip3
Could not find a version that satisfies the requirement pip3 (from versions: )
No matching distribution found for pip3

为什么我不能将 pip3 升级到 9.0？

---

解决方法是强制重新安装：

sudo -H pip3 install --upgrade pip --force-reinstall

Answer 1

验证它/usr/local/bin/pip3 --version是 9.0.1。如果不：

sudo python3 -m pip install --upgrade pip

即，使用pip来自该特定 Python 版本的包。