Let’s take a list like this as an example:
numbers = [i for i in xrange(1,11)] + [i for i in xrange(1,8)]
To remove duplicates in the numbers list you could use this code:
uk_numbers =  for n in numbers: if n not in uk_numbers: uk_numbers.append(n)
Or get the same result with a single line of code:
uk_numbers = list(set(numbers))
The latter method transforms the number list into a set, an object that does not allow duplicates, and then returns it to a list.