gistfile1.py

results = [(p1.address, p1.program), (p2.address, p2.program)]

grouped_results = {}
for elt in results: 
    if elt.address in grouped_results:
        grouped_results[elt.address].append(elt.program)
    else:
        grouped_results[elt.address] = [elt.program]
        
# To print out the groupings:
for address, programs in grouped_results.iteritems():
    print address
    print program for program in programs