How can I upgrade specific packages using pip and a requirements file?

How can I upgrade specific packages using pip and a requirements file?

django virtualenv pip

django

Where does pip install its packages?

python django pip virtualenv

django

No module named pkg_resources

python django virtualenv setuptools pip

django

'pip' is not recognized as an internal or external command

python django windows pip

django

Can't install via pip because of egg_info error

django windows python-2.7 pip

django

Bypass confirmation prompt for pip uninstall

python django module pip easy-install

django

Django Rest Framework -- no module named rest_framework

python django python-3.x pip django-rest-framework

django

How do I package a python application to make it pip-installable?

python django dependencies pip

django

how to use python2.7 pip instead of default pip

python linux django centos pip

django

Can't install psycopg2 with pip in virtualenv on Mac OS X 10.7

python django heroku pip psycopg2

django

pip install PIL fails

python django pip python-imaging-library

django

Get path of virtual environment in pipenv

python django pip pipenv

django

Could not find a version that satisfies the requirement pkg-resources==0.0.0

python django heroku pip

django

Supervising virtualenv django app via supervisor

django virtualenv pip supervisord

django

Warning: cannot find svn location for distribute==0.6.16dev-r0

python django pip

django