Data manipulation series Python

Hi there,

Data_manipulation_1 includes :

* displaying data, basic funtions (sum, count,sort), changing datatype
* creating plot by matplotlib, create corr_matrix, heat_map and basic analysis

Data_manipulation_2 includes :

* more manipulation processes like groupby, sort,count,drop/add columns
* functions like 'where' conditions and 'flagging' method in SQL
* String manipulations (normal and regex)
* Chunk method to deal with large dataset

Data_manipulation_3 (python vs SQL) includes :

* Queries which are written in Python and SQL