if you have wget installed, You can use it to get Wrapper.py and its dependency lists.
For the stable Wrapper.py:
wget https://raw.githubusercontent.com/benbaptist/minecraft-wrapper/master/Wrapper.py
wget https://raw.githubusercontent.com/benbaptist/minecraft-wrapper/master/requirements.txt
Or for the development version of Wrapper.py:
wget https://raw.githubusercontent.com/benbaptist/minecraft-wrapper/development/Wrapper.py
wget https://raw.githubusercontent.com/benbaptist/minecraft-wrapper/development/requirements.txt
To install dependencies, see dependencies section