Implement the function unique_in_order which takes as argument a sequence and returns a list of items without any elements with the same value next to each other and preserving the original order of elements.
For example:
unique_in_order('AAAABBBCCDAABBB') == ['A', 'B', 'C', 'D', 'A', 'B']
unique_in_order('ABBCcAD') == ['A', 'B', 'C', 'c', 'A', 'D']
unique_in_order([1,2,2,3,3]) == [1,2,3]
def unique_in_order(iterable):
pass
Solution:
def unique_in_order(iterable):
pre_item = None
result = []
for item in iterable:
if item != pre_item:
result.append(item)
pre_item = item
return result
