無法使用Homebrew Python在Mac上升級pip3

Question

我在Mac上升級pip3失敗，並在終端中得到（對我而言）令人困惑的答案：

> 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

為什么我不能將pip3升級到9.0？

---

解決方法是強制重新安裝：

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

Answer 1

驗證/usr/local/bin/pip3 --version為9.0.1。 如果不：

sudo python3 -m pip install --upgrade pip

即，使用該特定Python版本的pip包。