portage.cache.mappings

Module mappings

Classes

Mapping
In python-3.0, the UserDict.DictMixin class has been replaced by Mapping and MutableMapping from the collections module, but 2to3 doesn't currently account for this change:

MutableMapping
A mutable vesion of the Mapping class.

UserDict
Use this class as a substitute for UserDict.UserDict so that code converted via 2to3 will run:

OrderedDict

ProtectedDict
given an initial dict, this wraps that dict storing changes in a secondary dict, protecting the underlying dict from changes

LazyLoad
Lazy loading of values for a dict

Functions

[hide private]

SlotDict

slot_dict_class(keys, prefix='_val_')
Generates mapping classes that behave similar to a dict but store values as object attributes that are allocated via __slots__. source code

Variables

[hide private]

_slot_dict_classes = <WeakValueDictionary at 163988300>

__package__ = 'portage.cache'

Imports: sys, weakref

Function Details

[hide private]

slot_dict_class(keys, prefix=`'_val_'`)

source code

Generates mapping classes that behave similar to a dict but store values as object attributes that are allocated via __slots__. Instances of these objects have a smaller memory footprint than a normal dict object.

Parameters:

keys (Iterable) - Fixed set of allowed keys
prefix (String) - a prefix to use when mapping attribute names from keys

Returns: SlotDict

A class that constructs SlotDict instances having the specified keys.

Module mappings

slot_dict_class(keys, prefix='_val_')

slot_dict_class(keys, prefix=`'_val_'`)