python -m pip show scikit-learn  # to see which version and where scikit-learn is installedpython -m pip freeze  # to see all packages installed in the active virtualenvpython -c "import sklearn; sklearn.show_versions()"

download package file from source
apt-get update
cd <go downloaded directory>
tar -xvf <package file name>
cd <goto extracted folder>
./configure
make
make install
# check python version you installed
python3 -V