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first unique character in a string in python

def firstUniqChar(s):
    data = {}
    for i in range(len(s)):
        if s[i] not in data:
            data[s[i]] = i
        else:
            data[s[i]] = -1

    for i in data.values():
        if i >= 0:
            return i
    return -1

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first unique character in a string in python

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