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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 emit(events, stream=None, Dumper=Dumper, canonical=None, indent=None, width=None, allow_unicode=None, line_break=None):
 """ Emit YAML parsing events into a stream. If stream is None, return the produced string instead. """

    getvalue = None
    if stream is None:
        from StringIO import StringIO
        stream = StringIO()
        getvalue = stream.getvalue
    dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
            allow_unicode=allow_unicode, line_break=line_break)
    try:
        for event in events:
            dumper.emit(event)
    finally:
        dumper.dispose()
    if getvalue:
        return getvalue()