Skip to main content

Extra Python Collections - bags (multisets) and setlists (ordered sets)

Project description

Build Status Coverage

Documentation: http://collections-extended.lenzm.net/

GitHub: https://github.com/mlenzen/collections-extended

PyPI: https://pypi.python.org/pypi/collections-extended

Overview

collections_extended is a Python module providing a bag class, AKA multiset, a setlist class, which is a unique list or ordered set, a bijection class, RangeMap which is a mapping from ranges to values and a IndexedDict class, which is an ordered mapping whose elements can be accessed using index, in addition to key. There are also frozen (hashable) varieties of bags and setlists.

Tested against Python 2.7, 3.4, 3.5, 3.6, 3.7, PyPy & PyPy3.

Getting Started

>>> from collections_extended import bag, setlist, bijection, RangeMap, IndexedDict
>>> from datetime import date
>>> b = bag('abracadabra')
>>> b.count('a')
5
>>> b.remove('a')
>>> b.count('a')
4
>>> 'a' in b
True
>>> b.count('d')
1
>>> b.remove('d')
>>> b.count('d')
0
>>> 'd' in b
False

>>> sl = setlist('abracadabra')
>>> sl
setlist(('a', 'b', 'r', 'c', 'd'))
>>> sl[3]
'c'
>>> sl[-1]
'd'
>>> 'r' in sl  # testing for inclusion is fast
True
>>> sl.index('d')  # so is finding the index of an element
4
>>> sl.insert(1, 'd')  # inserting an element already in raises a ValueError
Traceback (most recent call last):
...
        raise ValueError
ValueError
>>> sl.index('d')
4

>>> bij = bijection({'a': 1, 'b': 2, 'c': 3})
>>> bij.inverse[2]
'b'
>>> bij['a'] = 2
>>> bij == bijection({'a': 2, 'c': 3})
True
>>> bij.inverse[1] = 'a'
>>> bij == bijection({'a': 1, 'c': 3})
True

>>> version = RangeMap()
>>> version[date(2017, 10, 20): date(2017, 10, 27)] = '0.10.1'
>>> version[date(2017, 10, 27): date(2018, 2, 14)] = '1.0.0'
>>> version[date(2018, 2, 14):] = '1.0.1'
>>> version[date(2017, 10, 24)]
'0.10.1'
>>> version[date(2018, 7, 1)]
'1.0.1'
>>> version[date(2018, 6, 30):] = '1.0.2'
>>> version[date(2018, 7, 1)]
'1.0.2'

>>> idict = IndexedDict()
>>> idict['a'] = "A"
>>> idict['b'] = "B"
>>> idict['c'] = "C"
>>> idict.get(key='a')
'A'
>>> idict.get(index=2)
'C'
>>> idict.index('b')
1

Installation

pip install collections-extended

Usage

from collections_extended import bag, frozenbag, setlist, frozensetlist, bijection

Classes

There are seven new classes provided:

Bags

bag
This is a bag AKA multiset.
frozenbag
This is a frozen (hashable) version of a bag.

Setlists

setlist
An ordered set or a list of unique elements depending on how you look at it.
frozensetlist
This is a frozen (hashable) version of a setlist.

Mappings

bijection
A one-to-one mapping.
RangeMap
A mapping from ranges (of numbers/dates/etc)
IndexedDict
A mapping that keeps insertion order and allows access by index.
Author:Michael Lenzen
Copyright:2019 Michael Lenzen
License:Apache License, Version 2.0
Project Homepage:
 https://github.com/mlenzen/collections-extended

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for collections-extended, version 1.0.3
Filename, size File type Python version Upload date Hashes
Filename, size collections_extended-1.0.3-py2.py3-none-any.whl (19.9 kB) File type Wheel Python version 3.7 Upload date Hashes View
Filename, size collections-extended-1.0.3.tar.gz (18.4 kB) File type Source Python version None Upload date Hashes View

Supported by

Pingdom Pingdom Monitoring Google Google Object Storage and Download Analytics Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page