TD MXC Python Wierzbiki

8/14/2019 TD MXC Python Wierzbiki

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Developer Productivity withPython and Jython

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Sun Confidential: Internal Only 2

Me

Frank Joseph Wierzbicki([email protected])

Project lead for Jython

Java Developer for 10 years

Python/Jython Developer for 10 years

Contributor to Jython for 4+ years


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What is Python?

A programming language that is:> Elegant and Robust> Powerful and as applicable as traditional compiled

languages> Easy to pick up, readability is at the forefront of the

language design> Easy to use, yet powerful

The fastest growing language of 2007 according toTiobe (http://www.tiobe.com)


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What is Jython?

Jython brings the Python language to the JVM.

Jython has full and nearly seamless integration intoany Java libraries and code.

Jython can access many of the libraries andframeworks written in Python.


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Some code

print hello world

def hello(name):

print hello, name


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Some Users of Python and Jython

Python> Google and YouTube> The new OpenSolaris packaging system (IPS)>

Ubuntu, Red Hat, etc for system utilities Jython

> IBM WebSphere for admin scripting> BEA Weblogic for admin scripting> Testing engines like PushToTest and the Grinder


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Demo: Jython installationand basics

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Jython and JDBC

Jython has built in support for DB-API, Python'sstandard database interface in the zxJDBCpackage.

zxjdbc is a thin wrapper around JDBC, Java'sstandard database interface.

Provides Python programmers with access to anydatabase with a JDBC driver.

Provides Java programmers with access to anyPython frameworks that are built on DB-API



Basic Database Access

from com.ziclix.python.sql import zxJDBC

db = zxJDBC.connect("jdbc:mysql://localhost/test"

'user', 'pass', "org.gjt.mm.mysql.Driver")cursor = db.cursor()

cursor.execute("select name from user")

for row in cursor.fetchall():

cursor.close()db.close()



Swing from Jython

from javax.swing import JTable

from javax.swing import JFrame

rowdata = [('bill', 'Bill Williams')]

colnames = ['user name', 'full name']

table = JTable(rowdata, colnames)

frame = JFrame("Table")

frame.getContentPane().add( table )frame.size = 400, 300

frame.visible = 1


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Demo: Database Access fromJython

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Django

A Python MVC framework with a web and databasebias (similar to Ruby on Rails)

Makes creating a project very simple

Comes with a powerful admin tool that can be usedto manage the data in your database no need towrite your own admin tool!

Very clean and simple design, easy to read andwrite.


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Demo: Django on Jython

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Hibernate From Jython

Hibernate is a ORM written in Java

It can be accessed as EJB3

Jython can be used



EJB3 From Jythonfrom javax.persistence import *

from hello import Continent # A Java class

emf = Persistence.createEntityManagerFactory(

"hibworld");

newEm = emf.createEntityManager();

newTx = newEm.getTransaction();newTx.begin();

continents = newEm.createQuery('select c from Continent c \

order by c.name asc').getResultList();

print continents.size(), " message(s) found:"for c in continents:

print c.name;

newTx.commit();

newEm.close();

emf.close();


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Demo: Hibernate/EJB3 FromJython

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SQLAlchemy

SQLAlchemy is a ORM written in pure Python

Written by Michael Bayer who consults onHibernate by day

Utilizes Python's strengths to create very clear ORMcode



SQLAlchemy Code Examplefrom sqlalchemy import *

db = create_engine('mysql://mydb:mydb@localhost/mydb')

metadata = MetaData(db)

continents = Table('continent', metadata,

Column('id', Integer, primary_key=True),Column('name', String(40)),

)

s = continents.select()r = s.execute()

for continent in r:

print continent.name



Where to find out more

http://www.jython.org

http://fwierzbicki.blogspot.com

Twitter: fwierzbicki

http://www.python.org


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El Zen de Python

1. Hermoso es mejor que feo. 2. Explcito es mejor que implcito.

3. Simple es mejor que complejo.

4. Complejo es mejor que complicado. 5. Plano es mejor que anidado.

6. Disperso es mejor que denso.

7. La legibilidad cuenta.

8. Los casos especiales no son suficientemente especialescomo para romper las reglas.

9. Aunque lo pragmtico gana a la pureza.

10. Los errores nunca deberan dejarse pasarsilenciosamente.


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S C fid ti l I t l O l

11. A menos que se silencien explcitamente.

12. Cuando te enfrentes a la ambigedad, rechaza la tentacin

de adivinar. 13. Debera haber una -- y preferiblemente slo una -- manera

obvia de hacerlo.

14. Aunque puede que no sea obvia a primera vista a menos

que seas holands. (NT: Guido van Rossum es holands) 15. Ahora es mejor que nunca.

16. Aunque muchas veces nunca es mejor que *ahora mismo*.

17. Si la implementacin es difcil de explicar, es una mala idea. 18. Si la implementacin es sencilla de explicar, puede que sea

una buena idea.

19. Los espacios de nombres son una gran idea -- tengamos

ms de esas!

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