|Build Status| |Coverage Status| binpacker ======
Generic Bin Packing Problem Solver.
Given a set of items with weight information and capacity of a bin,
Binpacker determines which items can fit in the bin with that
capacity and continues to pack all items in new bins in a way that
it will utilize the space of each bin. In the other word, Binpacker
can be used to determine what is the minimum number of bins we can
use to pack all items with different weights.
Requirements
------------
- Python 3.4 (tested)
Goal
----
The ultimate goal of this library is to provide a generic interface for
solving the Bin Packing problem for variety of applications.
Code sample
-----------
Lets say, given the capacity (11) of a bin and a list of packages with
different weights, we would like to load and unload the packages in a
way that it utilizes the space of each bin.
.. code:: python
import time
from binpacker.binpacker import Binpacker
from binpacker.binpacker import Item
packer = Binpacker(11)
packer.items = [
Item('A',4), Item('B',1), Item('C',2),
Item('D',6), Item('E',9), Item('F',3),
Item('G',7), Item('H',2), Item('I',5)
]
j=0
while True:
packer.pack_items()
for i, x in enumerate(packer.bins):
print('Bin ({}%) {}: {}'.format(x.utilization, i,[i.name for i in x.get_items()]))
print('----------------------------------')
packer._items.append(Item('Z{}'.format(i),2))
j += 1
time.sleep(3)
output:
Bin (100.0%) 0: ['H', 'C', 'F', 'A']
Bin (100.0%) 1: ['I', 'D']
Bin (90.91%) 2: ['B', 'E']
Bin (63.64%) 3: ['G']
----------------------------------
Bin (100.0%) 0: ['H', 'C', 'F', 'A']
Bin (100.0%) 1: ['I', 'D']
Bin (90.91%) 2: ['B', 'E']
Bin (81.82%) 3: ['Z0', 'G']
----------------------------------
Bin (100.0%) 0: ['H', 'C', 'F', 'A']
Bin (100.0%) 1: ['I', 'D']
Bin (90.91%) 2: ['B', 'E']
Bin (100.0%) 3: ['Z0', 'G', 'Z1']
----------------------------------
Bin (100.0%) 0: ['H', 'C', 'F', 'A']
Bin (100.0%) 1: ['I', 'D']
Bin (90.91%) 2: ['B', 'E']
Bin (100.0%) 3: ['Z0', 'G', 'Z1']
Bin (18.18%) 4: ['Z2']
----------------------------------
Bin (100.0%) 0: ['H', 'C', 'F', 'A']
Bin (100.0%) 1: ['I', 'D']
Bin (90.91%) 2: ['B', 'E']
Bin (100.0%) 3: ['Z0', 'G', 'Z1']
Bin (36.36%) 4: ['Z2', 'Z3']
----------------------------------
Bin (100.0%) 0: ['H', 'C', 'F', 'A']
Bin (100.0%) 1: ['I', 'D']
Bin (90.91%) 2: ['B', 'E']
Bin (100.0%) 3: ['Z0', 'G', 'Z1']
Bin (54.55%) 4: ['Z2', 'Z3', 'Z4']
- Note that (xxx%) is the percentage of fullness
Contributors
------------
.. |Build Status| image:: https://travis-ci.org/paulokuong/binpacker.svg?branch=master
:target: https://travis-ci.org/paulokuong/binpacker
.. |Coverage Status| image:: https://coveralls.io/repos/github/paulokuong/binpacker/badge.svg?branch=master
:target: https://coveralls.io/github/paulokuong/binpacker?branch=master
