How can calculate velocity of a column in a csv file : I have a csv file  which has two columns, the first is a Id of a person and the second the velocity . I want to find the average speed for every ID.
I have a csv files as :
0001;12
0001;0.14
0001;96
0002;19
0002;20
0002;6.3
0003;25
0003;1.9
0003;16

I am a beginner in python and don't really know many python tricks. What I do know is that I probably complicate too much in my code.

Thank you .