update ``pip`` to ``pip3``

[shlff]

Hi @jstac and @mmcky , I find we still use pip install --upgrade python in the tutorial of Jupinx. Since Python 2.7 reached its end of life on January 1st, 2020, this command line would cause some warnings, like the one attached below.

Shall we update it by using pip3? I am afraid that this command line would cause warnings elsewhere, such as our lectures.

[mmcky]

hey @shlff I am surprised that the pip your machine is using is the system-wide pip. do you have anaconda installed and is it in your .bashrc (pre os x 10.15) or zsh profile (post os x 10.15). Ifanacondais setup i thinkpip` should use the correct pip (i.e. pip3)

[shlff]

Thanks for your advice, @mmcky . I figured out what happened here and solved this issue. This occurred because if I had or installed Python before, even though my anaconda is set up, pip would not use the python installed under anaconda. I need to modify the path in my zsh profile.

Now, I set Python3 globally as my default python version and update pip to pip3 on my mac by using pyenv.

Do you think we should add a note here?

[shlff]

Thanks @mmcky . I understand what happens here. I will close this issue.