How to remove duplicates item from a list using Python

Python is very easy but you have to think just like python

  
def remove_dulicates(alist):
    elist =[]     #define an empty for new list without duplicate item
    for i in alist:                   
        if i not in elist:
            elist.append(i)
    return elist

print remove_dulicates([2,2,2,1,3,4,5])

output:[2, 1, 3, 4, 5]