How to reinstall the vim with Python 2 in macOS

[chusiang]

After I upgrade the Python 3.6 to 3.7, I will get warnning message like ycm-core/YouCompleteMe#1652

Error detected while processing function youcompleteme#Enable..80_SetUpPython:

and vim/vim#3117.

/must>not&exist/foo:1: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses

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My environment:

• OS: macOS 10.13.5
• Python: 2.7.15
• Python 3: 3.7.0
• YouCompleteMe plugin: e1ead995

[chusiang]

I see my environment is working on Python 2 in the MacVim.app,

Check the Python version in Vim. (Valloric/MatchTagAlways#44)

:echo has('python')  => 1
:echo has('python3') => 0

so I decide switch the Python to 2.7, not 3.7.

Reinstall the vim with Python 2 in macOS.

$ brew reinstall vim --with-python@2
==> Reinstalling vim --with-python@2
==> Downloading https://github.com/vim/vim/archive/v8.1.0100.tar.gz
==> Downloading from https://codeload.github.com/vim/vim/tar.gz/v8.1.0100
######################################################################## 100.0%
==> ./configure --prefix=/usr/local --mandir=/usr/local/Cellar/vim/8.1.0100_2/share/man --enabl
==> make
==> make install prefix=/usr/local/Cellar/vim/8.1.0100_2 STRIP=/usr/bin/true
🍺  /usr/local/Cellar/vim/8.1.0100_2: 1,432 files, 23.3MB, built in 1 minute 28 seconds

Happy hacking. 😎

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Reference:

1. Getting a deprecation warning using python 3.7 · Issue #44 · Valloric/MatchTagAlways
2. Error message printed first time python3 (version 3.7.0) dynamic library is imported · Issue #3117 · vim/vim

[chusiang]

以後沒事，還是不要在特別忙碌的日子裡，用什麼 brew upgrade 會比較好啊！！！☠️

[RanchoCooper]

Regardless of installed plugins, silently execute python3 once on the top of your vimrc:

if has('python3')
  silent! python3 1
endif