How Remove Duplicate Letters In A String

Is there a way to remove duplicate characters? For example if we input 'hello', the output will be 'helo'; another example is 'overflow', the output would be 'overflw'; another exa

Solution 1:

Change string to mystring:

def removeDupes(mystring):
    newStr = ""
    for ch in mystring:
        if ch not in newStr:
            newStr = newStr + ch
    return newStr

print removeDupes("hello")
print removeDupes("overflow")
print removeDupes("paragraphs")

>>> 
helo
overflw
parghs

Solution 2:

yes with something called a set:

unique = set()

[ unique.add(c) for c in 'stringstring' ]

Solution 3:

I would use collections.OrderedDict for this:

>>> from collections import OrderedDict
>>> data = "paragraphs"
>>> print "".join(OrderedDict.fromkeys(data))
parghs