yuza@yuza ~ $ pip install --upgrade pip
Requirement already up-to-date: pip in ./.local/lib/python2.7/site-packages
yuza@yuza ~ $ pip3 install --upgrade pip
Collecting pip
Using cached pip-9.0.1-py2.py3-none-any.whl
Installing collected packages: pip
Successfully installed pip-8.1.1
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
yuza@yuza ~ $ pip3 install sqlalchemy
Collecting sqlalchemy
Using cached SQLAlchemy-1.1.10.tar.gz
Could not import setuptools which is required to install from a source distribution.
Please install setuptools.


インポートエラー　ImportError: No module named 'sqlalchemy'
import sqlalchemy as sa

さて、どうする？　どうしたら良いですか？