Attempt to write a readonly database sqlite django reinhardt

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Attempt to write a readonly database sqlite django reinhardt

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Kuchling Introduction This article explains the new features in Python 2. There are some features such as generators and iterators that are completely new, but most of the changes, significant and far-reaching though they may be, are aimed at cleaning up irregularities and dark corners of the language design.

For full details, you should refer to the documentation for Python 2. If you want to understand the complete implementation and design rationale for a change, refer to the PEP for a particular new feature. PEPs and Type and Class Changes The largest and most far-reaching changes in Python 2.

You can subclass built-in types such as lists and even integers, and your subclasses should work in every place that requires the original type.

attempt to write a readonly database sqlite django reinhardt

As a small side benefit, attributes can now have docstrings, too. The list of legal attributes for an instance can be limited to a particular set using slots, making it possible to safeguard against typos and perhaps make more optimizations possible in future versions of Python.

Some users have voiced concern about all these changes. Many of the new features are quite esoteric, and you can write a lot of Python code without ever needed to be aware of them.

Instead this section will paint only the broad strokes. Old and New Classes First, you should know that Python 2. The old-style class model is exactly the same as the class model in earlier versions of Python.

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All the new features described in this section apply only to new-style classes. So how do you define a new-style class?

You do it by subclassing an existing new-style class. A new-style class named objectthe base class for all built-in types, has also been added so if no built-in type is suitable, you can just subclass object: The type objects for the built-in types are available as built-ins, named using a clever trick.

Python has always had built-in functions named intfloatand str. Descriptors In previous versions of Python, there was no consistent way to discover what attributes and methods were supported by an object.

The one big idea underlying the new class model is that an API for describing the attributes of an object using descriptors has been formalized. With the descriptor API, static methods and class methods become possible, as well as more exotic constructs.

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Attribute descriptors are objects that live inside class objects, and have a few attributes of their own: For example, when you write obj. This is also why static methods and class methods are now possible; they have descriptors that wrap up just the method, or the method and the class.

Class methods are passed the class of the object, but not the object itself. Static and class methods are defined like this: For example, it would be possible to write a descriptor class that made it possible to write Eiffel-style preconditions and postconditions for a method.

A class that used this feature might be defined like this: There will be a few wizards who need to know about it in order to write eiffelmethod or the ZODB or whatever, but most users will just write code on top of the resulting libraries and ignore the implementation details.

The Diamond Rule Multiple inheritance has also been made more useful through changing the rules under which names are resolved.Integrating Django with a legacy database Give Django your database parameters Auto-generate the models Install the core Django tables Test and tweak Outputting CSV with Django Using the Python CSV library Using the template system Other text-based formats Outputting PDFs with Django Install ReportLab Write your view Complex PDFs Further.

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attempt to write a readonly database sqlite django reinhardt

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