install pyenv and then install python 3.6.3 in that pyenv

install_pyenv.sh

# !/bin/bash

# Step 1. Install pyenv

git clone https://github.com/pyenv/pyenv.git ~/.pyenv
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc
echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.bashrc
source ~/.bashrc

# Step 2. Install missing headers for all the Python modules to be built

sudo zypper install readline-devel sqlite3-devel libbz2-devel zlib-devel libopenssl-devel libffi-devel

# Step 3. Install the desired Python version

pyenv install 3.6.3

# Step 4. Install virtualenv

sudo zypper install python3-virtualenv

# Step 5. Create a virtual environment for the installed Python and activate it

mkdir ~/pythons
cd ~/pythons
virtualenv -p ~/.pyenv/versions/3.6.3/bin/python3.6 python3.6.3
source ./python3.6.3/bin/activate