Python for Java developers

Transcript

1. Can I haz ur pythons? Rafael Medina García @rmed_dev Fco.

   Javier Honduvilla Coto @javierhonduco

2. Where is python?

3. Examples for the Java weenies

4. Simple TCP Socket: Java

5. Simple TCP Socket: Python

6. Reading a file: Java

7. Reading a file: Python

8. Hashtable: Java

9. “Hashtable”: Python

10. Why python rocks? • Function parameters • GC ◦ Reference

    counting • Decorators • Types (WTF) • List-Stack-Queue-[...] • PyPI

11. Concurrency is not parallelism • Concurrency ◦ GIL: Global Interpreter

    Lock (</3) i. threads vs processes • celery ii. tasks iii. groups iv. pipes • cpython, pypy

12. Celery • Async framework task Queue + Tasks = fun

13. Cpython and moar • cpython ◦ Guido’s Python Interpreter •

    pypy ◦ “an implementation of the Python programming language written in Python itself”

14. Web frameworks + wsgi • Django • Flask • ∞

15. Scientific packages • ipython + notebook • cython • numba...

16. Our fav libs • requests (http for humans) • SQLAlchemy

    (database toolkit)

17. SQLAlchemy I

18. SQLAlchemy II

19. Is (c)python slow? • Overhead • Cache misses • Complex

    data structures • Any variable can change its type • (dynamic)
20. None

21. Bibliography • https://jakevdp.github.io/blog/2014/05/09/why-python-is- slow/ • http://docs.python-requests.org/en/latest/ • https://bitbucket.org/zzzeek/sqlalchemy • http://wsgi.readthedocs.org/en/latest/

    • http://www.dabeaz.com/python/UnderstandingGIL.pdf • https://docs.python.org/2/library/gc.html • https://pypi.python.org/pypi • http://pypy.org/ • http://www.scipy.org/