[Baypiggies] nested list question

Vikram K kpguy1975 at gmail.com
Mon Jun 27 23:06:58 CEST 2011

Suppose i have the following nested list:

>>> x
[['19600894', '1', 'chr15_76136768', 'MISSENSE'], ['19600894', '2',
'chr15_76136768', 'MISSENSE'], ['18467762', '1', 'chr14_23354066',

How do i obtain from nested list x (given above), the following nested list

>>> z
[['chr15_76136768', 'MISSENSE'], ['chr14_23354066', 'MISSENSE']]

In other words, if the third element of an element of x is the same, then i
wish to combine it into a single element.
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