Before，I have been so install and use pip on the macOS：
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sudo easy_install pip3 pip3 install my_package |
later，This method is ineffective，Become such：
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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[……]