Create the environment with virtualenv –system-site-packages . Then, activate the virtualenv and when you want things installed in the virtualenv rather than the system python, use pip install –ignore-installed or pip install -I . That way pip will install what you’ve requested locally even though a system-wide version exists. Your python interpreter will look first … Read more
You can do this without installing anything into python itself. You don’t need sudo or any privileges. You don’t need to edit any files. Install virtualenv into a bootstrap virtual environment. Use the that virtual environment to create more. Since virtualenv ships with pip and distribute, you get everything from one install. Download virtualenv: http://pypi.python.org/pypi/virtualenv … Read more
pip defaults to installing Python packages to a system directory (such as /usr/local/lib/python3.4). This requires root access. –user makes pip install packages in your home directory instead, which doesn’t require any special privileges.
For Python-3 try removing virtual environment files. And resetting it up. rm -rf venv virtualenv -p /usr/bin/python3 venv/ source venv/bin/activate pip install -r requirements.txt https://wiki.ubuntu.com/XenialXerus/ReleaseNotes#Python_3 edit fo
If you want to run a Python subprocess under the virtualenv, you can do that by running the script using the Python interpreter that lives inside virtualenv’s /bin/ directory: import subprocess # Path to a Python interpreter that runs any Python script # under the virtualenv /path/to/virtualenv/ python_bin = “/path/to/virtualenv/bin/python” # Path to the script … Read more
This works for everyone: pip install -r /path/to/requirements.txt Explanation: -r, –requirement < filename > Install from the given requirements file. This option can be used multiple times.
Running with the system Python and libraries limits you to one specific Python version, chosen by your OS provider. Trying to run all Python applications on one Python installation makes it likely that version conflicts will occur among the collection of libraries. It’s also possible that changes to the system Python will break other OS … Read more
This is very good: http://simononsoftware.com/virtualenv-tutorial-part-2/ And this is a slightly more practical one: https://web.archive.org/web/20160404222648/https://iamzed.com/2009/05/07/a-primer-on-virtualenv/
July 2018 Update Most people should now use pip install setuptools (possibly with sudo). Some may need to (re)install the python-setuptools package via their package manager (apt-get install, yum install, etc.). This issue can be highly dependent on your OS and dev environment. See the legacy/other answers below if the above isn’t working for you. … Read more
This is my personal recommendation for beginners: start by learning virtualenv and pip, tools which work with both Python 2 and 3 and in a variety of situations, and pick up other tools once you start needing them. Now on to the answer to the question: what is the difference between these simalarly named things: … Read more