pip install Django on python3.6
If you have pip3 then directly use 
pip3 install Django
Else try to use virtualenv for your python version as :
pip -p python3.6 virtualenv name
then you can install any version of Django on it.
If I run pip install Django I get

Requirement already satisfied: Django in
  /usr/local/lib/python2.7/dist-packages

I'd like to use python3.6 instead (which is already installed in /usr/bin/python3.6). What's the correct pip syntax to install the last version of Django on python 3.6?