python Programming Glossary: imagezip
Python dynamic inheritance: How to choose base class upon instance creation? http://stackoverflow.com/questions/7057019/python-dynamic-inheritance-how-to-choose-base-class-upon-instance-creation try to create an instance of the concrete image class ImageZIP when it is given a gz file. Exactly in the same way it would.. create an instance of ImageJPG when given a jpg file. The ImageZIP class just wants to redefine the file_obj property. In no case.. on what file format is hiding inside the zip archive the ImageZIP classes needs to inherit either from ImageJPG or from ImagePNG..
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