By Zed A. Shaw
Zed Shaw has perfected the world's top process for studying Python. keep on with it and you may succeed-just just like the thousands of novices Zed has taught thus far! You deliver the self-discipline, dedication, and endurance; the writer provides every thing else.
Read Online or Download Learn Python the Hard Way: A Very Simple Introduction to the Terrifyingly Beautiful World of Computers and Code (3rd Edition) PDF
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Essential SQLAlchemy introduces a high-level open-source code library that makes it more uncomplicated for Python programmers to entry relational databases equivalent to Oracle, DB2, MySQL, PostgreSQL, and SQLite. SQLAlchemy has develop into more and more well known considering its unencumber, however it nonetheless lacks strong offline documentation. This useful booklet fills the space, and since a developer wrote it, you get an target examine SQLAlchemy's instruments instead of an advocate's description of all of the "cool" features.
SQLAlchemy contains either a database server-independent SQL expression language and an object-relational mapper (ORM) that allows you to map "plain outdated Python objects" (POPOs) to database tables with no considerably altering your latest Python code. crucial SQLAlchemy demonstrates easy methods to use the library to create an easy database software, walks you thru basic queries, and explains how one can use SQLAlchemy to connect with a number of databases concurrently with an identical Metadata. you furthermore mght learn the way to:
* Create customized varieties for use on your schema, and whilst it's important to take advantage of customized instead of integrated forms
* 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 items, shop them to a consultation, and flush them to the database
* Use SQLAlchemy to version item orientated inheritance
* offer a declarative, lively list trend to be used with SQLAlchemy utilizing the Elixir extension
* Use the SQLSoup extension to supply an automated metadata and item version in response to database mirrored image
In addition, you'll find out how 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" procedure that provides you precisely what you want to develop into effective with SQLAlchemy correct away.
Regular expressions are a really strong instrument for manipulating textual content and information. they're now regular gains in quite a lot of languages and well known instruments, together with Perl, Python, Ruby, Java, VB. web and C# (and any language utilizing the . web Framework), personal home page, and MySQL.
in the event you don't use average expressions but, you will find during this booklet an entire new international of mastery over your facts. in case you already use them, you'll savor this book's extraordinary element and breadth of assurance. in the event you imagine you recognize all you must find out about normal expressions, this publication is a beautiful eye-opener.
As this publication exhibits, a command of standard expressions is a useful ability. general expressions let you code complicated and refined textual content processing that you simply by no means imagined might be computerized. commonplace expressions can prevent time and aggravation. they are often used to craft dependent ideas to quite a lot of difficulties. as soon as you've mastered standard expressions, they'll turn into a useful a part of your toolkit. you'll ask yourself the way you ever received by way of with out them.
but regardless of their broad availability, flexibility, and unheard of strength, commonplace expressions are usually underutilized. but what's strength within the palms of a professional could be fraught with peril for the unwary. getting to know typical Expressions can assist you navigate the minefield to changing into a professional and assist you optimize your use of normal expressions.
learning usual Expressions, 3rd variation, now features a complete bankruptcy dedicated to Hypertext Preprocessor and its robust and expressive suite of standard expression capabilities, as well as greater Hypertext Preprocessor assurance within the relevant "core" chapters. additionally, this variation has been up to date all through to mirror advances in different languages, together with increased in-depth assurance of Sun's java. util. regex package deal, which has emerged because the common Java regex implementation. subject matters include:
* A comparability of good points between various types of many languages and instruments
* How the commonplace expression engine works
* Optimization (major reductions to be had right here! )
* Matching simply what you will want, yet no longer what you don't wish
* Sections and chapters on person languages
Written within the lucid, wonderful tone that makes a fancy, dry subject develop into crystal-clear to programmers, and sprinkled with suggestions to complicated real-world difficulties, learning normal Expressions, 3rd version bargains a wealth details so you might placed to rapid use.
Reviews of this re-creation and the second one edition:
"There isn't a greater (or extra necessary) booklet to be had on commonplace expressions. "
--Zak Greant, handling Director, eZ Systems
"A actual tour-de-force of a publication which not just covers the mechanics of regexes in remarkable element but additionally talks approximately potency and using regexes in Perl, Java, and . internet. .. if you happen to use average expressions as a part of your specialist paintings (even in case you have already got a great e-book on no matter what language you're programming in) i'd strongly suggest this e-book to you. "
--Dr. Chris Brown, Linux Format
"The writer does a great activity major the reader from regex amateur to grasp. The publication is intensely effortless to learn and chock filled with necessary and suitable examples. .. general expressions are worthwhile instruments that each developer must have of their toolbox. gaining knowledge of normal Expressions is the definitive advisor to the topic, and a very good source that belongs on each programmer's bookshelf. Ten out of Ten Horseshoes. "
--Jason Menard, Java Ranch
The Python Developer's instruction manual is designed to reveal skilled builders to Python and its makes use of. starting with a quick creation to the language and its syntax, the e-book strikes quick into extra complex programming themes, together with embedding Python, community programming, GUI toolkits, JPython, internet improvement, Python/C API, and extra.
Python 201 is the sequel to my first booklet, Python one hundred and one. should you already understand the fundamentals of Python and now you need to visit the following point, then this can be the ebook for you! This publication is for intermediate point Python programmers in simple terms. There will not be any newbie chapters the following. This booklet is predicated onPython three.
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Extra resources for Learn Python the Hard Way: A Very Simple Introduction to the Terrifyingly Beautiful World of Computers and Code (3rd Edition)
Look online for what the pydoc command does. 4. Use pydoc to also read about open, file, os, and sys. It’s alright if you do not understand those; just read through and take notes about interesting things. Common Student Questions How come I get SyntaxError: invalid syntax whenever I run pydoc? You aren’t running pydoc from the command line; you’re probably running it from inside python. Exit out of python ﬁrst. Why does my pydoc not pause like yours does? Sometimes if the help document is short enough to ﬁt on one screen, then pydoc will just print it.
Why does this not make sense to me? Try making the numbers in this script your measurements. It’s weird, but talking about yourself will make it seem more real. 30 EXERCISE 6 Strings and Text W hile you have already been writing strings, you still do not know what they do. In this exercise, we create a bunch of variables with complex strings so you can see what they are for. First an explanation of strings. A string is usually a bit of text you want to display to someone or “export” out of the program you are writing.
If you put quotes around them, then they are turned into strings and won’t work right. You’ll learn more about how these work in Exercise 27. I tried putting Chinese (or some other non-ASCII characters) into these strings, but %r prints out weird symbols. Use %s to print that instead and it’ll work. Why does %r sometimes print things with single-quotes when I wrote them with double-quotes? Python is going to print the strings in the most efﬁcient way it can, not replicate exactly the way you wrote them.