Python __index__ special method

Question

>>> class Thing(object):
...     def __index__(self):
...         return 1
... 
>>> thing = Thing()
>>> list_ = [\'abc\', \'def\', \'ghi\'         


        

Answer 1

Another example to understand it further, here _MolsToGridSVG takes a list argument. I wanted to limit the list to some length. Now here for python list, slice indices have to be used. The following implementation solved it. Basically here index is getting used for Python List.

def __index__(self):
    return 1

imagesInOneFile = int(len(smilesMolList) / noOfFiles)
svg = Draw._MolsToGridSVG(smilesMolList[:imagesInOneFile.__index__()], subImgSize=(400, 200), molsPerRow=2)

Also one needs to remember that imagesInOneFile has to be integer.