Category: Python

By Rick Copeland

Crucial SQLAlchemy introduces a high-level open-source code library that makes it more uncomplicated for Python programmers to entry relational databases akin to Oracle, DB2, MySQL, PostgreSQL, and SQLite. SQLAlchemy has turn into more and more renowned considering that its unlock, however it nonetheless lacks strong offline documentation. This functional publication fills the distance, and since a developer wrote it, you get an aim examine SQLAlchemy's instruments instead of an advocate's description of all of the "cool" features.

SQLAlchemy comprises either a database server-independent SQL expression language and an object-relational mapper (ORM) that permits you to map "plain previous Python objects" (POPOs) to database tables with no considerably altering your latest Python code. crucial SQLAlchemy demonstrates tips on how to use the library to create an easy database software, walks you thru easy queries, and explains how one can use SQLAlchemy to connect with a number of databases concurrently with an identical Metadata. you furthermore may learn the way to:

* Create customized kinds for use on your schema, and whilst it's beneficial to take advantage of customized instead of integrated types
* Run queries, updates, and deletes with SQLAlchemy's SQL expression language
* construct an item mapper with SQLAlchemy, and comprehend the variations among this and energetic checklist styles utilized in different ORMs
* Create gadgets, store them to a consultation, and flush them to the database
* Use SQLAlchemy to version item orientated inheritance
* offer a declarative, energetic list trend to be used with SQLAlchemy utilizing the Elixir extension
* Use the SQLSoup extension to supply an automated metadata and item version in keeping with database reflection

In addition, you'll learn the way and whilst to take advantage of different extensions to SQLAlchemy, together with AssociationProxy, OrderingList, and more.

Essential SQLAlchemy is the much-needed consultant for each Python developer utilizing this code library. rather than a feature-by-feature documentation, this publication takes an "essentials" method that provides you precisely what you want to develop into effective with SQLAlchemy immediately.

By Johannes Hubertz

Der Autor erläutert, wie Qualität Vertrauen in die Schutzmaßnahmen schafft: Neu entwickelte software program kann durch Test-Driven improvement kontinuierlich auf die Einhaltung der Anforderungen überprüft werden, diese sind dank explizit formulierter checks stets nachvollziehbar. software program zuverlässig zu machen, ist das Ziel von Softwaretests. Qualitätssicherung kann durch Testen mit verschiedenen Werkzeugen, die durch Python bereitgestellt werden, bei der Software-Entwicklung Risiken vermeiden. Nur intestine getestete software program kann verlässlich die ständig vorhandene Anforderung nach Vertraulichkeit, Verfügbarkeit und Datenintegrität sicherstellen.

By Marty Alchin

Django is the prime Python internet program improvement framework. easy methods to leverage the Django internet framework to its complete power during this complicated instructional and reference. recommended through Django, Pro Django roughly choices up the place The Definitive consultant to Django left off and examines in higher aspect the weird and intricate difficulties that Python internet software builders can face and the way to resolve them.

* presents in–depth information regarding complex instruments and strategies to be had in each Django installation
* Runs the gamut from the idea of Django’s inner operations to genuine code that solves real–world difficulties for high–volume environments
* is going above and past different books, leaving the fundamentals behind
* exhibits how Django can do issues even its middle builders by no means dreamed possible

<h3>What you’ll learn</h3> * See the best way to use Django’s versions, perspectives, kinds, and templates.
* deal with HTTP and customizing again ends.
* Use Django’s universal tooling.
* hire Django in a variety of environments.
* construct a company software program suite to be used within the company world.
* Make this code reusable—even distributable.

<h3>Who is that this booklet for?</h3>
This booklet is for firms searching for a framework able to helping company wishes, in addition to complex Python or net builders seeking to clear up strange, complicated problems.
<h3>About the Apress professional Series</h3>
The Apress professional sequence books are sensible, expert tutorials to maintain you on and relocating up the pro ladder.

You have got the activity, now you want to hone your talents in those tricky aggressive occasions. The Apress seasoned sequence expands your talents and services in just the parts you wish. grasp the content material of a professional e-book, and you'll continuously be ready to get the activity performed in a certified improvement undertaking. Written via specialists of their box, seasoned sequence books from Apress provide the hard–won strategies to difficulties you are going to face on your specialist programming career.

By Pedro Kroger

Are you curious about studying extra approximately tune yet have stumbled on so much fabric condescending or to provide issues magically rather than logically? the good news is that a lot of track may be understood with programming and math, issues you're already solid at! during this publication you'll research a few parts of track from a programmer's point of view. You'll know about the primitives of track equivalent to notes and period, the technique of combining these primitives into reasons and chords, operations reminiscent of transposition, retrograde, and inversion, and the technique of abstraction (phrases and shape) utilizing Python and a few simple arithmetic. each notion during this ebook is defined in English with a corresponding implementation in Python, utilizing the Pyknon track library.

By Leon Sterling, Ehud Shapiro

This new version of The paintings of Prolog incorporates a variety of vital adjustments. such a lot heritage sections on the finish of every bankruptcy were up to date to take account of significant fresh learn effects, the references were vastly increased, and extra complex workouts have been further which were used effectively in educating the direction. half II, The Prolog Language, has been changed to be appropriate with the recent Prolog average, and the bankruptcy on application improvement has been considerably altered: the predicates outlined were moved to extra applicable chapters, the part on potency has been moved to the significantly accelerated bankruptcy on cuts and negation, and a brand new part has been additional on stepwise enhancement -- a scientific manner of developing Prolog courses built via Leon Sterling. All yet one among the chapters partially III, complicated Prolog Programming recommendations, have been considerably replaced, with a few significant rearrangements. a brand new bankruptcy on interpreters describes a rule language and interpreter for professional platforms, which higher illustrates how Prolog will be used to build professional structures. The bankruptcy on application transformation is thoroughly new and the bankruptcy on common sense grammars provides new fabric for spotting basic languages, displaying how grammars observe to extra desktop technology examples.

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By Igor Milovanovic

This publication is written in a Cookbook kind special in the direction of a complicated viewers. It covers the complicated subject matters of information visualization in Python.Python info Visualization Cookbook is for builders that already find out about Python programming quite often. when you have heard approximately information visualization yet you don't be aware of the place to begin, then this ebook will advisor you from the beginning and assist you comprehend information, info codecs, facts visualization, and the way to take advantage of Python to imagine data.You might want to be aware of a few basic programming options, any form of programming event should be invaluable, however the code during this e-book is defined nearly line through line. You don't want maths for this publication, each idea that is brought is punctiliously defined in simple English, and references can be found for extra curiosity within the subject

By Nigel George

Promises completely every little thing you are going to ever want to know to develop into a grasp Django programmer approximately This ebook * achieve an entire realizing of Django-the preferred, Python-based net framework on the earth * achieve the abilities to effectively designing, constructing, and deploying your app * This ebook is packaged with totally defined code so that you can study the basics and the complex issues to get a whole realizing of all of Django's middle capabilities Who This ebook Is For This publication assumes you've a easy figuring out of the web and programming. event with Python or Django will be a bonus, yet isn't important. it really is excellent for newbie to intermediate programmers trying to find a quick, safe, scalable, and maintainable replacement internet improvement platform to these in line with Hypertext Preprocessor, Java, and dotNET. What you'll study * Use Django to entry user-submitted shape information, validate it, and paintings with it * Get to grasp complicated URLconf information and tips * expand Django's template process with customized code * outline versions and use the database API to create, retrieve, replace, and delete files * absolutely expand and customise the default implementation as according to your project's wishes * try out and install your Django program * Get to grasp extra approximately Django's consultation, cache Framework, and middleware intimately gaining knowledge of Django: middle is a totally revised and up-to-date model of the unique Django booklet, written by way of Adrian Holovaty and Jacob Kaplan-Moss - the creators of Django. the most objective of this e-book is to make you a Django professional. through studying this e-book, you are going to examine the abilities had to strengthen strong web pages quick, with code that's fresh and straightforward to take care of. This publication can also be a programmer's guide that gives whole insurance of the present long-term aid (LTS) model of Django. For builders developing functions for advertisement and company serious deployments, getting to know Django: middle offers a whole, up to date source for Django 1.8 LTS with a reliable code-base, defense fixes and help out to 2018. kind and method This finished step by step useful consultant deals an intensive figuring out of the entire internet improvement thoughts on the topic of Django. as well as explaining the positive factors of Django, this booklet offers real-world event on how those positive factors healthy jointly to construct striking apps.

By Dahlquist

By Cyrille Rossant

Learn IPython for interactive Python programming, high-performance numerical computing, and knowledge visualization.

Overview

• a realistic step by step instructional with the intention to assist you to switch the Python console with the strong IPython command-line interface;
• Use the IPython pc to modernize how you engage with Python;
• practice hugely effective computations with NumPy and Pandas;
• Optimize your code utilizing parallel computing and Cython.

In Detail

You already use Python as a scripting language, yet were you aware it's also more and more used for medical computing and knowledge research? Interactive programming is vital in such exploratory initiatives and IPython is the correct software for that. as soon as you’ve learnt it, you won't manage to dwell with out it.

Learning IPython for Interactive Computing and information Visualization is a realistic, hands-on, example-driven instructional to significantly enhance your productiveness in the course of interactive Python classes, and exhibits you the way to successfully use IPython for interactive computing and information analysis.

This booklet covers all elements of IPython, from the hugely robust interactive Python console to the numerical and visualization beneficial properties which are generally linked to IPython.

You will learn the way IPython allows you to practice effective vectorized computations, via examples masking numerical simulations with NumPy, info research with Pandas, and visualization with Matplotlib. additionally, you will realize how IPython should be very easily used to optimize your code utilizing parallel computing and dynamic compilation in C with Cython.

Learning IPython for Interactive Computing and information Visualization will let you optimize your productiveness in interactive Python sessions.

What you are going to study from this book

• Debug your code from the IPython console;
• Benchmark and profile your code from IPython;
• practice effective vectorized computations with NumPy;
• study facts tables with Pandas;
• Create visualizations with Matplotlib;
• Parallelize your code simply with IPython;
• customise IPython and create your individual magic commands;
• speed up your Python code utilizing dynamic C compilation with Cython.

Approach

A functional hands-on consultant which specializes in interactive programming, numerical computing, and information research with IPython.

Who this e-book is written for

This booklet is for Python builders who use Python as a scripting language or for software program improvement, and have an interest in studying IPython for expanding their productiveness in the course of interactive periods within the console.

Knowledge of Python is needed, while no wisdom of IPython is necessary.

By Erik Westra

Process, examine, and show geospatial info utilizing Python libraries and comparable tools

About This Book

• Learn to construct an entire geospatial program from scratch utilizing Python
• Create handsome maps in accordance with the result of your analysis
• This is a fast moving advisor that can assist you discover the major thoughts of geospatial to acquire top of the range spatial data

Who This e-book Is For

If you're an skilled Python developer and need to get up-to-speed with geospatial programming, then this ebook is for you. whereas familiarity with fitting third-party Python libraries will be a bonus, no earlier wisdom of geospatial programming is required.

What you are going to Learn

• Understand the main geospatial suggestions and strategies had to research and paintings with geospatial data
• Learn the way to learn and write geospatial information from inside your Python code
• Use PostGIS to shop spatial information and practice spatial queries
• Use Python libraries to research and manage geospatial data
• Generate maps according to your spatial data
• Implement whole geospatial research structures utilizing Python
• Use the Shapely and NetworkX libraries to unravel difficulties resembling distance-area calculations, discovering the shortest course among issues, buffering polygons, and masses more

In Detail

Python is a hugely expressive language that makes it effortless to jot down refined courses. Combining top quality geospatial facts with Python geospatial libraries provide you with a robust toolkit for fixing various geospatial programming tasks.

The ebook starts with an creation to geospatial research and programming and explains the information at the back of geospatial info. you'll discover Python libraries for construction your individual geospatial functions. you are going to discover ways to create a geospatial database to your program utilizing PostGIS and the psycopg2 library, and spot how the Mapnik library can be utilized to create beautiful and necessary maps.

Finally, you'll learn how to use the Shapely and NetworkX libraries to create, study, and control advanced geometric items, earlier than enforcing a procedure to check GPS recordings opposed to a database of roads to supply a heatmap of the main usually used roads.