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3. Data model — Python rc1 documentation
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All data in a Python program is represented by objects or by relations Special read-only attribute: __dict__ is the module's namespace as a When inheriting from a class without __slots__, the __dict__ and __weakref__ attribute of the.


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Table Of Contents 1. This is mentioned in the SWIG documentation. New in version 2. But it does help complete the picture for the usage of slots and some of the reasoning behind them. The os module and sys, and path 8. This is bad, because the control freaks should be abusing the metaclasses and the static typing weenies should be abusing decorators, since in Python, there should be only one obvious way of doing something. Iterators 2. Classes 6. Generators 3. Namespace and scoping rules 7. In the future, a check may be added to prevent this. It is not very common but you may find it useful someday. Decorators 5. Variables, expressions, statements, types 3. Notes about booleans and logical operators Notes on tricky issues in Python CGI module 4. You can see the slots as the static version that does not allow additional attributes. The regular expression module The string module The shelve module The md5 and sha modules The temporary file module The time module Threading Types module Working with XML Web Services The collections module The heapq module Last updated on Aug 14, Created using Sphinx 1.{/INSERTKEYS}{/PARAGRAPH} The main idea is as follows. Packaging 8. Quoting absent third parties is unhelpful. Python Notes 0. Files 9. Notes about sorting lists and dictionaries 9. Unfortunately there is a side effect to slots. They change the behavior of the objects that have slots in a way that can be abused by control freaks and static typing weenies. Changed in version 2. Data Structures list, dict, tuples, sets, strings 5. This class variable can be assigned a string, iterable, or sequence of strings with variable names used by instances. Now, for some people this might seem way too much space for just a couple of attributes. {PARAGRAPH}{INSERTKEYS}It is especially useful if you need to allocate thousands of objects that would otherwise take lots of memory space. This page: Show source. This renders the meaning of the program undefined. Note, however, that it has some side effects e. Print function 7. Exceptions 4. By default, instances of both old and new-style classes have a dictionary for attribute storage. It is related more to building extensions than it does to using the slots syntax on an object. Attempts to assign to an unlisted variable name raises AttributeError. Functions 6. This wastes space for objects having very few instance variables. Module 8. Nearly everything about numbers 4. The space consumption can become acute when creating large numbers of instances. If a class defines a slot also defined in a base class, the instance variable defined by the base class slot is inaccessible except by retrieving its descriptor directly from the base class. Enter search terms or a module, class or function name. The pickle module 9. As you may know every object in Python contains a dynamic dictionary that allows adding attributes. Instead, all attribute access is done directly via pointers. For high performance libraries that want to reduce function overhead for commonly called functions using slots is much faster. Search Enter search terms or a module, class or function name. Now this may not be directly related to the OPs question. Mappings may also be used; however, in the future, special meaning may be assigned to the values corresponding to each key.