How to determine parallactic angle using pyephem [closed] - python

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How can I determine the parallactic angle of a target in pyEphem given a fixed object and an observer?
I am trying to use pyEphem to create an instrument simulator and I need to determine the rate at which the instrument rotator will be turning to de-rotate the field (this is an alt-az telescope), so really I'm trying to determine the rate of change of the parallactic angle.
thanks,
Josh

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I'm looking to find out how to write the code to see how many values a key has in a dictionary.
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I have a large sparse matrix (lil) implemented in Python with scipy, which comprises of Users on one axis, and songs they played on the other. So each row is a linked list of the songs that user has played.
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I would like to know whether it is possible to carry out such an operation, that one picture is placed into another one at exact coordinates, automatedly.
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