Beginning Python: From Novice to Professional (2nd Edition) - download pdf or read online

By Magnus Lie Hetland

ISBN-10: 1430206349

ISBN-13: 9781430206347

Achieve a basic realizing of Python's syntax and lines with the second one variation of starting Python, an up–to–date creation and useful reference. protecting a wide range of Python–related programming issues, together with addressing language internals, database integration, community programming, and internet prone, you'll be guided by means of sound improvement ideas. Ten accompanying tasks will make sure you can get your fingers soiled in no time.

Updated to mirror the most recent in Python programming paradigms and a number of other of the main an important good points present in Python 3.0 (otherwise often called Python 3000), complicated subject matters, reminiscent of extending Python and packaging/distributing Python purposes, also are coated.

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Extra resources for Beginning Python: From Novice to Professional (2nd Edition)

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Press Once you press the Enter key, the window closes (because the program is finished). pyw. ) Double-click it as before. What happens? Nothing! How can that be? I will tell you later in the book—I promise. Comments The hash sign (#) is a bit special in Python. When you put it in your code, everything to the right of it is ignored (which is why the Python interpreter didn’t choke on the /usr/bin/env stuff used earlier). Here is an example: # Print the circumference of the circle: print 2 * pi * radius The first line here is called a comment, which can be useful in making programs easier to understand—both for other people and for yourself when you come back to old code.

Py you saved in the previous section. ) There is one problem with running your program like this, however. Once you’ve entered your name, the program window closes before you can read the result. The window closes when the program is finished. Try changing the script by adding the following line at the end: raw_input("Press ") 10. This behavior depends on your operating system and the installed Python interpreter. If you’ve saved the file using IDLE in Mac OS X, for example, double-clicking the file will simply open it in the IDLE code editor.

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.

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Beginning Python: From Novice to Professional (2nd Edition) by Magnus Lie Hetland

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