how to remove all duplicates from a given string in python code example

Example 1: python remove duplicates words from string

def unique_list(l):
    ulist = []
    [ulist.append(x) for x in l if x not in ulist]
    return ulist

a="calvin klein design dress calvin klein"
a=' '.join(unique_list(a.split()))

Example 2: remove consecutive duplicates python

def remove_consecutive_duplicates(_list: list):
    preprocessed_list = []
    for x in itertools.groupby(_list):
        preprocessed_list.append(x[0])

    return preprocessed_list