time series calculation in list comprehension?

[falcon]

Is there a way I can do time series calculation, such as a moving
average in list comprehension syntax?  I'm new to python but it looks
like list comprehension's 'head' can only work at a value at a time.  I
also tried using the reduce function and passed in my list and another
function which calculates a moving average outside the list comp. ...
but I'm not clear how to do it.  Any ideas?  Thanks.