When we are programming, we often need to remove duplicate elements, so what should we do? Let's look at the following example:
>>> a =list(range(10))>>> a[0,1,2,3,4,5,6,7,8,9]>>> a = a *2>>> a[0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9]>>> a =list(set(a))>>> a[0,1,2,3,4,5,6,7,8,9]>>>
We first create a list, and then repeat the list, so that each element has a redundancy.
We take advantage of the fact that there are no repeating elements in the set, and convert the list into a set to remove the repeating elements.
Because our previous data structure was a list, for the unification, the final output still uses a list. So we need to transform the collection into a list again.
