Before that，I have been so install and use pip on the macOS：
|
1 2 3 |
sudo easy_install pip3 pip3 install my_package |
later，This method is ineffective，Become such：
|
1 2 3 4 |
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py python get-pip.py pip install my_package |
Finally one day，I need to update it prompted pip，then：
[cray[……]