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Project Description

An immutable wrapper around an OrderedDict.

FrozenOrderedDict was inspired by https://pypi.python.org/pypi/frozendict/ (and borrows some code from it). With regards to immutability, it solves the same problems:

  • Because dictionaries are mutable, they are not hashable and cannot be used in sets or as dictionary keys.
  • Nasty bugs can and do occur when mutable data structures are passed around.

It can be initialized just like a dict or OrderedDict. However, be advised that just like with OrderedDict, keyword arguments are not recommended since their insertion order is arbitrary.

Once instantiated, an instance of FrozenOrderedDict cannot be altered, since it does not implement the MutableMapping interface.

It does implement the Mapping interface, so can be used just like a normal dictionary in most cases.

In order to modify the contents of a FrozenOrderedDict, a new instance must be created. The easiest way to do that is by calling the .copy() method. It will return a new instance of FrozenOrderedDict initialized using the following steps:

  1. A copy of the wrapped OrderedDict instance will be created.
  2. If any arguments or keyword arguments are passed to the .copy() method, they will be used to create another OrderedDict instance, which will then be used to update the copy made in step #1.
  3. Finally, self.__class__() will be called, passing the copy as the only argument.
Release History

Release History

1.2.0

This version

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1.1.1

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1.1.0

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1.0.1

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1.0.0

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0.1.0

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
frozenordereddict-1.2.0.tar.gz (2.9 kB) Copy SHA256 Checksum SHA256 Source Jun 21, 2015

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