By Magnus Lie Hetland
ISBN-10: 1590599829
ISBN-13: 9781590599822
Achieve a primary realizing of Python's syntax and lines with the second one version of starting Python, an up–to–date creation and sensible reference. masking a big selection of Python–related programming issues, together with addressing language internals, database integration, community programming, and internet companies, you'll be guided via sound improvement ideas. Ten accompanying initiatives will make sure you can get your palms soiled in no time.
Updated to mirror the newest in Python programming paradigms and several other of the main the most important beneficial properties present in Python 3.0 (otherwise often called Python 3000), complex subject matters, similar to extending Python and packaging/distributing Python purposes, also are coated.
Read Online or Download Beginning Python: From Novice to Professional (2nd Edition) PDF
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Extra resources for Beginning Python: From Novice to Professional (2nd Edition)
Example text
If there is a syntax error anywhere in your program, Python displays an error message and quits, and you will not be able to run the program. During the first few weeks of your programming career, you might spend a lot of time tracking down syntax errors. As you gain experience, you will make fewer errors and find them faster. Runtime error: The second type of error is a runtime error, so called because the error does not appear until after the program has started running. These errors are also called exceptions because they usually indicate that something exceptional (and bad) has happened.
A function definition specifies the name of a new function and the sequence of statements that run when the function is called. ") Composition | 23 def is a keyword that indicates that this is a function definition. The name of the function is print_lyrics. The rules for function names are the same as for variable names: letters, numbers and underscore are legal, but the first character can’t be a number. You can’t use a keyword as the name of a function, and you should avoid having a variable and a function with the same name.
2360679774997898 But in a script, if you call a fruitful function all by itself, the return value is lost for‐ ever! sqrt(5) This script computes the square root of 5, but since it doesn’t store or display the result, it is not very useful. Void functions might display something on the screen or have some other effect, but they don’t have a return value. If you assign the result to a variable, you get a special value called None: >>> result = print_twice('Bing') Bing Bing >>> print(result) None The value None is not the same as the string 'None'.