Epically winning at Python!

1. Python
Environments!
Epically winning at Python!
Glen Zangirolami
Twitter @glenbot
http://theglenbot.com
Prepared for the 100th PyHou meetup.

2. Environments!
Porque?

3. Environments!
Porque?
Isolation - Python packages and even versions live in
their own little $HOME!

4. Environments!
Porque?
Isolation - Python packages and even versions live in
their own little $HOME!
Permissions - Not everyone is 1337 and can be a sudoer.

5. Environments!
Porque?
Isolation - Python packages and even versions live in
their own little $HOME!
Permissions - Not everyone is 1337 and can be a sudoer.
Organization - each project can maintain it’s own
requirements file of python packages and you don’t
have version overlap.

6. Environments!
Porque?
Isolation - Python packages and even versions live in
their own little $HOME!
Permissions - Not everyone is 1337 and can be a sudoer.
Organization - each project can maintain it’s own
requirements file of python packages and you don’t
have version overlap.
Anti-globalization - installing stuff to the system
globally is generally not a good idea, unless it’s
something like PIP.

8. Ok fine. But how?

9. Ok fine. But how?
virtualenv
http://pypi.python.org/pypi/virtualenv
virtualenvwrapper
http://www.doughellmann.com/projects/
virtualenvwrapper/
pythonbrew
https://github.com/utahta/pythonbrew

10. virtualenv

11. virtualenv
$ easy_install pip
$ pip install virtualenv
$ virtualenv <ENV>

12. virtualenv
$ easy_install pip
$ pip install virtualenv
$ virtualenv <ENV>
This creates a folder <ENV> in the $PWD.
<ENV>/lib/pythonX.X/site-packages

13. virtualenvwrapper

14. virtualenvwrapper
$ pip install virtualenvwrapper

15. virtualenvwrapper
$ pip install virtualenvwrapper
Some simple environment vars need to go into .bashrc
export WORKON_HOME=$HOME/.virtualenv
source /usr/local/bin/virtualenvwrapper.sh
export PIP_VIRTUALENV_BASE=$WORKON_HOME
export PIP_RESPECT_VIRTUALENV=true

16. virtualenvwrapper
$ pip install virtualenvwrapper
Some simple environment vars need to go into .bashrc
export WORKON_HOME=$HOME/.virtualenv
source /usr/local/bin/virtualenvwrapper.sh
export PIP_VIRTUALENV_BASE=$WORKON_HOME
export PIP_RESPECT_VIRTUALENV=true
The last package that you should ever install
globally

17. virtualenv + virtualenvwrapper =

18. virtualenv + virtualenvwrapper =
Can you guess it?

19. virtualenv + virtualenvwrapper =
Can you guess it?

20. 1up - pythonbrew

21. 1up - pythonbrew
$ curl -kL http://xrl.us/pythonbrewinstall | bash

22. 1up - pythonbrew
$ curl -kL http://xrl.us/pythonbrewinstall | bash
Some simple code needs to go into .bashrc
[[ -s $HOME/.pythonbrew/etc/bashrc ]] && source
$HOME/.pythonbrew/etc/bashrc

23. virtualenv + virtualenvwrapper + pythonbrew =

24. virtualenv + virtualenvwrapper + pythonbrew =
Can you guess it?

25. virtualenv + virtualenvwrapper + pythonbrew =
Can you guess it?

26. Using
virtualenvwrapper
$ mkvirtualenv python-rules
$ workon python-rules
$ pip install pygett
$ deactivate
$ cdsitepackages
$ lssitepackages
$ rmvirtualenv python-rules

27. Using pythonbrew
$ pybrew list
$ pybrew install --force 2.7.2
$ pybrew switch 2.7.2
$ pybrew install --force 2.4.6
$ pybrew switch 2.4.6
$ pybrew venv create -p 2.7.2 python-rules
$ pybrew off
$ pybrew py awesome_script.py

28. Holy grail of
pythonbrew

29. Holy grail of
pythonbrew
Are you ready for this?

30. Holy grail of
pythonbrew
Are you ready for this?
Ok, maybe it’s not THAT epic ;)

31. Holy grail of
pythonbrew
Are you ready for this?
Ok, maybe it’s not THAT epic ;)
$ pybrew py awesome_script.py

32. Holy grail of
pythonbrew
Are you ready for this?
Ok, maybe it’s not THAT epic ;)
$ pybrew py awesome_script.py
What does this do?!?! It tests your python script against all
python versions! EPIC!

33. Let’s reiterate

34. Let’s reiterate
virtualenv & virtualenvwrapper allow you to
create environments and manage them with
the default system Python.

35. Let’s reiterate
virtualenv & virtualenvwrapper allow you to
create environments and manage them with
the default system Python.
pybrew is like virtualenv & virtualenvwrapper
had babies with a BRAWNDO ENERGY
DRINK! WIN AT PYTHON!

36. The EPIC end.
Thanks for listening.
I’m Glen Zangirolami and I love developing EPIC
Python projects that WIN.
Twitter @glenbot
http://theglenbot.com