I have a list named results, I want to get rid of the duplicate items in the list, the expected result and my results does not match, I checked my code but cannot find what is the problem, what happened? Thanks a lot!
results = [[-4, -2, 6], [-4, -2, 6], [-4, -2, 6], [-4, -2, 6], [-4, -2, 6], [-4, -2, 6], [-4, 0, 4], [-4, 0, 4], [-4, 1, 3], [-4, 1, 3], [-4, 2, 2], [-4, 2, 2], [-4, 2, 2], [-2, -2, 4], [-2, -2, 4], [-2, -2, 4], [-2, -2, 4], [-2, 0, 2], [-2, 0, 2], [-2, 0, 2], [-2, -2, 4], [-2, -2, 4], [-2, 0, 2], [-2, 0, 2], [-2, 0, 2], [-2, 0, 2], [-2, 0, 2], [-2, 0, 2]]i = 0
while i < len(results): j = i+1while j < len(results):if(set(results[i]) == set(results[j])):results.remove(results[j])else:j = j+1i = i+1
print(results)OUTPUT:
[[-4,-2,6],[-4,0,4],[-4,1,3],[-4,2,2],[-2,-2,4],[-2,-2,4],[-2,0,2]]EXPECTED RESULT:
[[-4,-2,6],[-4,0,4],[-4,1,3],[-4,2,2],[-2,-2,4],[-2,0,2]]
UPDATE: I got it. no problem with the logic of this code but I made a simple mistake with one place (sorry...I am a newbie). I should replace method "remove" by method "del", because I want to remove the item with specified index, if use "remove", it always remove the first one shows up in the list of that value. Anyway, Thanks to all!
For example:
myList = ['Apple', 'Banana', 'Carrot','Apple']
myList.remove(myList[3])
print(myList)
expected output:['Apple', 'Banana', 'Carrot']
actual output: ['Banana', 'Carrot', 'Apple']myList = ['Apple', 'Banana', 'Carrot','Apple']
del (myList[3])
print(myList)
OUTPUT: ['Apple', 'Banana', 'Carrot']
SOLUTION to my question:
### use "del" instead of "remove"
#results.remove(results[j])
del results[j]Another simple test example similar to my original question:
results = [[-2, -2, 4], [-2, 0, 2], [-2, 0, 2], [-2, 0, 2], [-2, -2, 4]]
i = 0
while i < len(results): j = i+1while j < len(results):print(results[i],results[j])if(set(results[i]) == set(results[j])):#would get incorrect answer with "replace"results.remove(results[j])#try "del" to get the correct answer#del (results[j]) else:j = j+1
i = i+1
print(results)