Emett - Python Followup

I'm a Python developer and just wanted to add to the question about Python packages.

It is always best to install Python packages through pip into a virtualenv and keep the system packages as clean as possible. If you are using Python 3.3+ you can use the built in venv package to setup your virtualenv. This works just like virtualenv but doesn't need a 3rd party package to be installed. If the package does need to be installed system wide such as "uwsgi/gunicorn/salt/ansible/etc..." for "web hosting/management/etc..." you would want to use pip outside of the virtualenv.

This will allow you to install a spastic version of the package and update it when you want to not when the package maintainer does and update. You can also use pip to install a package directly from a "website/github/local folder/etc...". If your system also needs to have multiple versions of Python 3 and Python 2.7 you can have a pip for all of them on one system without the risk of stepping on one another "pip-2.7/pip-3.4/pip-3.5/etc.." then when you need a specific version of Python in your script/application you would use the shebang to declare the version at the top of your script/application file.




Please find below some examples and links to documentation.

venv documentation:

https://docs.python.org/3/library/venv.html"



pip documentation:

https://pip.pypa.io/en/stable/



pip specific version install:

pip install django==1.8



pip install from github repo:

pip install -e git+https://github.com/mycroftai/adapt#egg=adapt-parser



pip install from sourceforge:

pip install -Iv http://sourceforge.net/projects/mysql-python/files/mysql-python/1.2.2/MySQL-python-1.2.2.tar.gz/download



pip install from folder:

pip install -e /path/to/my/package/



pip install only for the current user:

pip install --user django



pip update package:

pip install -U django

pip install --upgrade django



pip install packages in bulk:

- You will need a text file with each package on its own line like the example below



requirements.txt file:

Django

Fabric>=1.2.0

Jinja2<=2.5.5

PyYAML==3.09



- Once this file has been created you will run the following command

   - pip install -r requirements.txt



- You can also update with the same file by running the following command

    - pip install --upgrade -r requirements.txt



Please feel free to reach out to me through email or IRC if you have any questions or if I was unclear on anything. I'm also normally in the "freebsd/freebsd-python/django/django-channels" IRC chat rooms under the name "The-Kid".