Pim Klanke added the comment:

This is in fact the third catagory of select(), "exceptional conditions", but 
because some find the term "exceptional" confusing when used in a Python 
module, we decided to use the term "urgent data", borrowed from the poll(2) man 
page. (see bpo-30844)

An example of an exceptional conditions event is "out of band", another one is 
edge detection from GPIO Sysfs Interface.

The patch for fulfilling this issue can and will be supplied if and when 
bpo-30844 is merged. 30844 originally also contained the patch to asyncio, but 
I was asked to split it into two separate patches.

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<http://bugs.python.org/issue30847>
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