arrays - Loop that skips the values it already done -

with code mange take take different possibilities, add them , put in data in arrays. problem duplicated data want skip. example:

first: name1, name2, total points of 2 , total price two. then: name2, name1, total points of 2 , total price two. which exact same result in diffrent order.

data list of 3 colums 50 lines ( name , price , point )

price = 0 points = 0  l1 = [] l2 = [] l3 = [] l4 = []  in range(0,18):     i2 in range(0,18):         points = data['points'][i]+data['points'][i2]         price = data['price'][i]+data['price'][i2]          if price < 10 , != i2:             l1.append(points)             l2.append(price)             l3.append(data['name'][i])             l4.append(data['name'][i2])              print points , price, data['name'][i], data['name'][i2]             print '_____'             print '' 

question: how solve problem?

change loop avoid going on every combination twice:

for in range(0,18):     i2 in range(0,i):         ... 

i delay points = data['points'][i]+data['points'][i2] calculation after if case save little time.

and don't need initialize variables price = 0, points = 0 since redefined on every iteration anyway. python dynamic langue variable declarations unnecessary.