cyordereddict 0.1

A drop-in replacement for the standard library’s OrderedDict that is 2-3x faster. Currently only for Python 2.7.

Benchmarks:

Test	Code	Ratio (stdlib / cython)
__init__ empty	OrderedDict()	1.7
__init__ list	OrderedDict(list_data)	3.2
__init__ dict	OrderedDict(dict_data)	3.1
__setitem__	ordereddict[-1] = False	2.9
__getitem__	ordereddict[100]	2.4
update	ordereddict.update(dict_data)	2.9
__iter__	list(ordereddict)	5.7
__contains__	100 in ordereddict	1.8

Numbers larger than 1 mean cyorderedict is faster. To run yourself, use cyordereddict.benchmark().

Install:

pip install cyordereddict

Dependencies:

cyorderedict is written with Cython, but requires no dependecies other than CPython and a C compiler.

Use:

try:
    from cyordereddict import OrderedDict
except ImportError:
    from collections import OrderedDict

License:

MIT. cyordereddict is largely adapted from the Python standard library, which is available under the Python Software Foundation License.