How to sort a list of objects based on an attribute of the objects?

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I"ve got a list of Python objects that I"d like to sort by an attribute of the objects themselves. The list looks like:

>>> ut
[<Tag: 128>, <Tag: 2008>, <Tag: <>, <Tag: actionscript>, <Tag: addresses>,
 <Tag: aes>, <Tag: ajax> ...]

Each object has a count:

>>> ut[1].count
1L

I need to sort the list by number of counts descending.

I"ve seen several methods for this, but I"m looking for best practice in Python.

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