[ Python 常見問題 ] How do I update pip itself from inside my virtual environment?

Source From Here
Question
I'm able to update pip-managed packages, but how do I update pip itself? According to pip --version, I currently have pip 1.1 installed in my virtual env and I want to update to the latest version.

How-To
pip is just a PyPI package like any other; you could use it to upgrade itself the same way you would upgrade any package:

# pip install --upgrade pip