By Magnus Lie Hetland

Achieve a primary knowing of Python’s syntax and lines with the second one variation of starting Python, an up–to–date creation and functional reference. overlaying a big selection of Python–related programming themes, together with addressing language internals, database integration, community programming, and internet prone, you’ll be guided through sound improvement ideas. Ten accompanying initiatives will make sure you can get your palms soiled in no time.
Updated to mirror the most recent in Python programming paradigms and a number of other of the main an important gains present in the approaching Python 3.0 (otherwise referred to as Python 3000), complicated issues, comparable to extending Python and packaging/distributing Python purposes, also are covered.
What you’ll learn
- turn into a trained Python programmer through following besides a pleasant, useful advisor to the language’s key features.
- Write code speedier by means of studying how one can make the most of complicated positive aspects resembling magic tools, exceptions, and abstraction.
- achieve perception into glossy Python programming paradigms together with trying out, documentation, packaging, and distribution.
- study through following besides ten fascinating initiatives, together with a P2P file–sharing program, chat customer, game, distant textual content editor, and extra. whole, downloadable code is supplied for every project!
Who is that this e-book for?
Programmers, beginner and differently, looking a finished creation to the Python programming language.
About the Apress starting Series
The starting sequence from Apress is the appropriate option to get the knowledge you must land that the most important entry–level activity. those books will train you a customary and demanding know-how from the floor up simply because they're explicitly designed to take you from “novice to professional.” You’ll begin your trip through seeing what you want to know—but with no useless idea and filler. You’ll construct your ability set by means of studying how you can prepare real–world tasks step-by-step. So no matter if your objective is your subsequent occupation problem or a brand new studying chance, the start sequence from Apress will take you there—it is your depended on consultant via unexpected territory!

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Name = input("What is your name? ") File "", line 0, in ? NameError: name 'Gumby' is not defined The problem is that input assumes that what you enter is a valid Python expression (it’s more or less the inverse of repr). If you write your name as a string, that’s no problem: What is your name? "Gumby" Hello, Gumby! However, it’s just a bit too much to ask that users write their name in quotes like this. Therefore, we use raw_input, which treats all input as raw data and puts it into a string: >>> input("Enter a number: ") Enter a number: 3 3 >>> raw_input("Enter a number: ") Enter a number: 3 '3' Unless you have a special need for input, you should probably use raw_input.

You supply it with parameters (in this case, 2 and 3) and it returns a value to you. 666666666666 ■Note The exact number of decimals may vary depending on which version of Python you are using. Several built-in functions can be used in numeric expressions like this. 0 Notice the difference between the two last expressions. Integer division always rounds down, whereas round rounds to the nearest integer. But what if you want to round a given number down? 9 years old, but you would like to round that down to 32 because she isn’t really 33 yet.

In addition, you’ll take another close look at strings. In Chapter 5, you learn more about statements, and after that you’ll be ready to write some really nifty programs. CHAPTER 2 ■■■ Lists and Tuples T his chapter introduces a new concept: data structures. A data structure is a collection of data elements (such as numbers or characters, or even other data structures) that is structured in some way, such as by numbering the elements. The most basic data structure in Python is the sequence. Each element of a sequence is assigned a number—its position, or index.

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