[Tutor] How to create a dictionary for ount elements

[jarod_v6 at libero.it]

HI there!!!
I have  afile like this:
file.txt
programs 	sample	gene
program1	sample1	TP53
program1	sample1	TP53
program1	sample2	PRNP
program1	sample2	ATF3
program2	sample1	TP53
program2	sample1	PRNP
program2	sample2	TRIM32
program2	sample2	TLK1
program2	sample2	KIT


with open("prova.csv") as p:
    for i in p:
   ...:         lines = i.rstrip("\n").split("\t")
   ...:         print lines 
   ...:         
['programs ', 'sample', 'gene', 'values']
['program1', 'sample1', 'TP53', '2']
['program1', 'sample1', 'TP53', '3']
['program1', 'sample2', 'PRNP', '4']
['program1', 'sample2', 'ATF3', '3']
['program2', 'sample1', 'TP53', '2']
['program2', 'sample1', 'PRNP', '5']
['program2', 'sample2', 'TRIM32', '4']
['program2', 'sample2', 'TLK1', '4']


I want to create a dictionary with set data with the names of the genes:

example:
dic = {}


dic['program1-sample1] = set(TP53)
dic['program1-sample2] = set(TP53,PRNP,ATF3)

So If I have a dictionary like that I can compare two set  I will compare the 
capacity of the programs in function of the gene show.
Thanks in advance for your help!