Can I haz ur pythons? Rafael Medina García @rmed_dev Fco. Javier Honduvilla Coto @javierhonduco

Where is python?

Examples for the Java weenies

Simple TCP Socket: Java

Simple TCP Socket: Python

Reading a file: Java

Reading a file: Python

Hashtable: Java

“Hashtable”: Python

Why python rocks? ● Function parameters ● GC ○ Reference counting ● Decorators ● Types (WTF) ● List-Stack-Queue-[...] ● PyPI

Concurrency is not parallelism ● Concurrency ○ GIL: Global Interpreter Lock (3) i. threads vs processes ● celery ii. tasks iii. groups iv. pipes ● cpython, pypy

Celery ● Async framework task Queue + Tasks = fun

Cpython and moar ● cpython ○ Guido’s Python Interpreter ● pypy ○ “an implementation of the Python programming language written in Python itself”

Web frameworks + wsgi ● Django ● Flask ● ∞

Scientific packages ● ipython + notebook ● cython ● numba...

Our fav libs ● requests (http for humans) ● SQLAlchemy (database toolkit)

SQLAlchemy I

SQLAlchemy II

Is (c)python slow? ● Overhead ● Cache misses ● Complex data structures ● Any variable can change its type ● (dynamic)

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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/