[Django]-Install pip3 package using ansible instead of pip2

Try to use executable option. Excerpt from pip module doc:

executable (added in 1.3)

The explicit executable or a pathname to the executable to be used to run pip for a specific version of Python installed in the system. For example pip-3.3, if there are both Python 2.7 and 3.3 installations in the system and you want to run pip for the Python 3.3 installation. It cannot be specified together with the ‘virtualenv’ parameter (added in 2.1). By default, it will take the appropriate version for the python interpreter use by ansible, e.g. pip3 on python 3, and pip2 or pip on python 2.

Update:

To combine virtualenv path and alternative executable, use virtualenv_command like this:

- pip:
    virtualenv: /tmp/py3
    virtualenv_command: /usr/bin/python3 -m venv
    name: boto

Absolute path is required for virtualenv_command.