Python: Best Way to remove duplicate character from string

How can I remove duplicate characters from a string using Python? For example, let's say I have a string:

foo = "SSYYNNOOPPSSIISS"

How can I make the string:

foo = SYNOPSIS

I'm new to python and What I have tired and it's working. I knew there is smart and best way to do this.. and only experience can show this..

def RemoveDupliChar(Word):
        NewWord = " "
        index = 0
        for char in Word:
                if char != NewWord[index]:
                        NewWord += char
                        index += 1
        print(NewWord.strip()) 

NOTE: Order is important and this question is not similar to this one.

Using itertools.groupby:

>>> foo = "SSYYNNOOPPSSIISS"
>>> import itertools
>>> ''.join(ch for ch, _ in itertools.groupby(foo))
'SYNOPSIS'

This is a solution without importing itertools:

foo = "SSYYNNOOPPSSIISS"
''.join([foo[i] for i in range(len(foo)-1) if foo[i+1]!= foo[i]]+[foo[-1]])

Out[1]: 'SYNOPSIS'

But it is slower than the others method!

How about this:

oldstring = 'SSSYYYNNNOOOOOPPPSSSIIISSS'
newstring = oldstring[0]
for char in oldstring[1:]:
    if char != newstring[-1]:
        newstring += char