How can I automate manual data validation using Python?

[python300]

Here is what I do manually as of now:
I take raw data from source DB tables and do manual calculations on it using excel if needed. These manual calculations are on same lines of business logic. Finally I show the resulting numbers from my manual or excel computation and match it with what application shows for the same time frame.

I have basic understanding of Python. What are the learning resources and libraries I will need? Any suggestions are greatly appreciated.

[Larz60+]

you can search for packages here: https://pypi.python.org/pypi
chose those that have been updated recently, or that are downloaded on a regular basis.
For example, a search on excel returns: https://pypi.python.org/pypi?%3Aaction=s...mit=search
But it might be worth learning pandas. See here: http://pandas.pydata.org/