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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 dump(stream=None):
 """ Dumps a string representation of `FILTERS` to a stream, normally an open file. If none is passed, `FILTERS` is dumped to a default location within the project. """

    if stream:
        stream.write(dumps())
    else:
        path = os.path.join(os.path.dirname(insights.__file__), _filename)
        with open(path, "wu") as f:
            f.write(dumps())