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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def to_str(obj):
 """Attempts to convert given object to a string object """

    if not isinstance(obj, str) and PY3 and isinstance(obj, bytes):
        obj = obj.decode('utf-8')
    return obj if isinstance(obj, string_types) else str(obj)