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April 2, 2016 01:59
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A bin packer script. I use it to efficiently pack folders of stuff for DVD burning. It does not handle recursive folders: only files in 'top level' folders.
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| import math | |
| import os | |
| from os.path import join, getsize, isfile, isdir | |
| def as_blocks(val): | |
| return math.ceil(val/2048.0) # dvd block size | |
| def getKey(item): | |
| return item[1] | |
| class Bin(object): | |
| ''' Container for items that keeps a running sum ''' | |
| def __init__(self): | |
| self.items = [] | |
| self.sum = 0 | |
| def append(self, item): | |
| self.items.append(item) | |
| self.sum += item[1] | |
| def __str__(self): | |
| ''' Printable representation ''' | |
| return 'Bin(sum=%d, items=%s)' % (self.sum, str(self.items)) | |
| # total blocks on DVD: 2295104 | |
| db = [] | |
| # treat files as a 'box' | |
| # treat one level of subdirectories as a 'box' | |
| #mypath = 'e:/to_backup/software' | |
| mypath = 'r:/anime/@to_burn' | |
| for foo in os.listdir(mypath): | |
| fullpath = join(mypath, foo) | |
| if os.path.isfile(fullpath): | |
| db.append( (foo, as_blocks(getsize(fullpath)))) | |
| else: | |
| db.append( (foo, as_blocks(sum(getsize(join(fullpath, subnames)) for subnames in os.listdir(fullpath))))) | |
| for bar in db: | |
| print( "Box: ", bar[0], "Size:", bar[1] ) | |
| # bin pack | |
| BIN_SIZE = 2295104 # total blocks on DVD | |
| # sort the items BY SIZE | |
| items = sorted(db, key=getKey) | |
| print ("Sorted:") | |
| for bar in items: | |
| print( "Box: ", bar[0], "Size:", bar[1] ) | |
| bins = [] | |
| while (len(items) > 0): | |
| x = items.pop() | |
| placed = False | |
| for b in bins: | |
| if (b.sum + x[1] < BIN_SIZE): | |
| b.append(x) | |
| break | |
| else: | |
| bin = Bin() | |
| bin.append(x) | |
| bins.append(bin) | |
| for b in bins: | |
| print(b) | |
| if (b.sum > BIN_SIZE): | |
| print('Too large for DVD') |
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