clean up
clean up
clean up
added Practice problems
added intro to python link
add python exercises
Merge pull request #3 from sampathweb/master

Added Python Exercises for Lab 1
Lecture 1
lab 2 files
Merge branch 'master' of https://github.com/ga-students/DAT_SF_11
Merge pull request #4 from sampathweb/master

lab 02 files
update to lab2
Merge pull request #5 from sampathweb/master

update to lab2
Lecture 2 changes