Help yourself develop the intuition of a Data Scientist and make use of this tutorial. Understanding some of the mechanics is essential to help you get the lift you are looking for with Panda or Python data manipulation.

http://bit.ly/LearnDataWrangling

Learn the Data Science Hacks You Need

https://twitter.com/DamianMingle

Learn how to get your answer with one little code-snippet

Reference is "Pandas for Data Analysis" by Wes McKinney
http://www.SocietyOfDataScientists.com