Macでpipをインストール方法

macで pip コマンドをインストールする方法
pip3 コマンドが使えるようになる

brew install python 

実行結果

 Python has been installed as
  /usr/local/bin/python3

***中略***



==> sqlite
sqlite is keg-only, which means it was not symlinked into /usr/local,
because macOS provides an older sqlite3.


If you need to have sqlite first in your PATH run:
  echo 'export PATH="/usr/local/opt/sqlite/bin:$PATH"' >> ~/.bash_profile


For compilers to find sqlite you may need to set:
  export LDFLAGS="-L/usr/local/opt/sqlite/lib"
  export CPPFLAGS="-I/usr/local/opt/sqlite/include"


==> python
Python has been installed as
  /usr/local/bin/python3


Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin


If you need Homebrew's Python 2.7 run
  brew install python@2


You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages


See: https://docs.brew.sh/Homebrew-and-Python

参考

Pythonのパッケージ管理システムpipの使い方 | note.nkmk.me