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 and RangeMap which is a mapping from ranges to values. There are also frozen (hashable) varieties of bags and setlists.

Tested against Python 2.6, 2.7, 3.3, 3.4, 3.5, 3.6, PyPy & PyPy3.

Getting Started

>>> from collections_extended import bag, setlist, bijection, RangeMap
>>> 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

>>> us_presidents = RangeMap()
>>> us_presidents[date(1993, 1, 20):date(2001, 1, 20)] = 'Bill Clinton'
>>> us_presidents[date(2001, 1, 20):date(2009, 1, 20)] = 'George W. Bush'
>>> us_presidents[date(2009, 1, 20):] = 'Barack Obama'
>>> us_presidents[date(1995, 5, 10)]
'Bill Clinton'
>>> us_presidents[date(2001, 1, 20)]
'George W. Bush'
>>> us_presidents[date(2021, 3, 1)]
'Barack Obama'
>>> us_presidents[date(2017, 1, 20):] = 'Someone New'
>>> us_presidents[date(2021, 3, 1)]
'Someone New'

Installation

pip install collections-extended

Usage

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

Classes

There are six 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)
Author:Michael Lenzen
Copyright:2018 Michael Lenzen
License:Apache License, Version 2.0
Project Homepage:
 https://github.com/mlenzen/collections-extended

Project details


Release history Release notifications

This version
History Node

1.0.1

History Node

1.0.0

History Node

0.10.1

History Node

0.9.0

History Node

0.8.2

History Node

0.8.0

History Node

0.7.2

History Node

0.7.0

History Node

0.6.0

History Node

0.5.2

History Node

0.5.1

History Node

0.5.0

History Node

0.4.0

History Node

0.3.1

History Node

0.3.0

History Node

0.2.0

Download files

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

Filename, size & hash SHA256 hash help File type Python version Upload date
collections_extended-1.0.1-py2.py3-none-any.whl (17.8 kB) Copy SHA256 hash SHA256 Wheel 3.6 Apr 14, 2018
collections-extended-1.0.1.tar.gz (13.7 kB) Copy SHA256 hash SHA256 Source None Apr 14, 2018

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging CloudAMQP CloudAMQP RabbitMQ AWS AWS Cloud computing Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page