def __init__(self, fields, target=sys.stdout):
self.fields = fields<EOL>self.target = target<EOL>
Create a processor that prints the requested fields' values

        This is useful for strings with newlines in them. Keep in mind that the
        fields will be popped from the event dictionary, so they will not be
        visible to anything (other processors and the logger itself) after this
        processor has printed them.

        :param fields: An iterable specifying the fields to print
        :param target: A file-like object to print to