Stumbling Toward 'Awesomeness'

A Technical Art Blog

Saturday, June 26, 2010

Python: Special Class Methods

I have really been trying to learn some Python fundamentals lately, reading some books and taking an online class. So: wow. I can’t believe that I have written so many tools, some used by really competent people at large companies, without really understanding polymorphism and other basic Python concepts.

Here’s an example of my sequence method from before, but making it a class using special class methods:
class imSequence:
	def __init__(self, file):
		dir = os.path.dirname(file)
		file = os.path.basename(file)
		segNum = re.findall(r'\d+', file)[-1]
		self.numPad = len(segNum)
		self.baseName = file.split(segNum)[0]
		self.fileType = file.split('.')[-1]
		globString = self.baseName
		for i in range(0,self.numPad): globString += '?'
		self.images = glob.glob(dir+'\\'+globString+file.split(segNum)[1])
	def __len__(self):
		return len(self.images)
	def __iter__(self):
		return iter(self.images)

Here’s an example of use:

seq = imSequence('seq\\test_00087.tga')
print len(seq)
print 'BaseName: %s  FileType: %s  Padding: %s' % (seq.baseName, seq.fileType, seq.numPad)
>>BaseName: test_  FileType: tga  Padding: 5
for image in seq: print image

[More info and examples: Dive Into Python: Special Class Methods]

posted by admin at 10:16 PM  


  1. Clever! Thanks for sharing it!

    Comment by maximd — 2010/08/27 @ 10:33 PM

  2. Love your Python blogs. Which online class did you attend, and would you recommend it?

    Comment by Jon — 2010/08/29 @ 4:27 PM

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