Python for Java developers

Transcript

1. 1.

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

   Javier Honduvilla Coto @javierhonduco
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   Where is python?

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   Examples for the Java weenies

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   Simple TCP Socket: Java

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   Simple TCP Socket: Python

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   Reading a file: Java

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   Reading a file: Python

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   Hashtable: Java

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   “Hashtable”: Python

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    Why python rocks? • Function parameters • GC ◦ Reference

    counting • Decorators • Types (WTF) • List-Stack-Queue-[...] • PyPI
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    Concurrency is not parallelism • Concurrency ◦ GIL: Global Interpreter

    Lock (</3) i. threads vs processes • celery ii. tasks iii. groups iv. pipes • cpython, pypy
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    Celery • Async framework task Queue + Tasks = fun

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

    pypy ◦ “an implementation of the Python programming language written in Python itself”
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    Web frameworks + wsgi • Django • Flask • ∞

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

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

    (database toolkit)
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    SQLAlchemy I

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    SQLAlchemy II

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

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