By Marty Alchin
ISBN-10: 1430258101
ISBN-13: 9781430258100
Tips on how to leverage Django, the prime Python internet software improvement framework, to its complete power during this complex educational and reference. up to date for Django 1.5 and Python three, seasoned Django, moment variation examines in nice aspect the advanced difficulties that Python internet software builders can face and the way to resolve them. It presents in–depth information regarding complicated instruments and strategies to be had in each Django deploy, operating the gamut from the speculation of Django’s inner operations to real code that solves real–world difficulties for high–volume environments.
Pro Django, moment variation is going above and past different books, leaving the fundamentals a ways in the back of and exhibiting how Django can do issues even its center builders by no means anticipated. by way of drawing at the dynamic nature of Python, you could write Django functions that extend the boundaries of what you inspiration attainable!
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Sample text
Unfortunately, this is formatted exactly as it was in the original source file, including extra line breaks and unnecessary indentation. To format docstrings in a more readable manner, Python’s inspect module provides another useful function, getdoc(). It removes unnecessary line breaks, as well as any extra indentation that was a side effect of where the docstring was written. The removal of indentation merits a bit of explanation. Essentially, getdoc() finds the leftmost non-whitespace character in the string, counts up all the whitespace between that character and the start of the line it’s in, and removes that amount of whitespace from all the other lines in the docstring.
Def __set__(self, instance, value): 32 Chapter 2 ■ Django Is Python ... >>> ... attr Unfortunately, this technique requires giving the attribute’s name to the descriptor explicitly. You can work around this with some metaclass tricks; Django’s model system (discussed in Chapter 3) shows one possible workaround. Introspection Many Python objects carry metadata beyond the code they execute. This information can be quite useful when working with a framework or writing your own. Python’s introspection tools can help greatly when trying to develop reusable applications, as they allow Python code to retrieve information about what a programmer wrote without requiring the programmer to write it all over again.
Essentially, getdoc() finds the leftmost non-whitespace character in the string, counts up all the whitespace between that character and the start of the line it’s in, and removes that amount of whitespace from all the other lines in the docstring. This way, the resulting string is leftjustified but retains any additional indents that exist for the sake of formatting the documentation. >>> def func(arg): ... """ ... Performs a function on an argument and returns the result. ... arg ... The argument to be processed ...