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Question: How do you remove duplicates from a list?

Answer: If you don't mind reordering the list, sort it and then scan from the end of the list, deleting duplicates as you go:

if List:
List.sort()
last = List[-1]
for i in range(len(List)-2, -1, -1):
if last==List[i]: del List[i]
else: last=List[i]

If all elements of the list may be used as dictionary keys (i.e. they are all hash able) this is often faster

d = {}
for x in List: d[x]=x
List = d.values()

If you don't mind reordering the list, sort it and then scan from the end of the list, deleting duplicates as you go:

if List:
List.sort()
last = List[-1]
for i in range(len(List)-2, -1, -1):
if last==List[i]: del List[i]
else: last=List[i]

If all elements of the list may be used as dictionary keys (i.e. they are all hash able) this is often faster

d = {}
for x in List: d[x]=x
List = d.values() Source: CoolInterview.com

>>> a = [1,2,3,4,4,5,5,6,1,2]
>>> list(set(a))
[1, 2, 3, 4, 5, 6] Source: CoolInterview.com

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