【练习】(a,b)和(b,a)是相同的,如何去除(b,a)保留(a,b)

时间:2022-07-11 00:16:28
 
[(0, 3), (0, 11), (1, 8), (1, 9), (1, 15), (3, 0), (8, 1), (8, 9), (8, 15), (9, 1), (9, 8), (9, 15), (11, 0), (15, 1), (15, 8), (15, 9)]
里面(a,b)和(b,a)是相同的,如何去除(b,a)保留(a,b)
l1 = [(0, 3), (0, 11), (1, 8), (1, 9), (1, 15), (3, 0), (8, 1), (8, 9),
      (8, 15), (9, 1), (9, 8), (9, 15), (11, 0), (15, 1), (15, 8), (15, 9)]
new_l = []
for i in l1:
    if (i[1],i[0]) in new_l:
        pass
    else:
        new_l.append(i)
print(new_l)