Added example code that change the previous ExhaustiveEnumetation.py to a different way in the condition of the if statement. Added comments to the For_Loop_Cuberoot.py.
Added example code that change the previous For_Loop-StringIterate.py.
Added example and excersices from the Lecture number 3, of the course 600x.
Added more examples and excersices from the Lecture number 3, of the course 600x.