human
Complete this python program:
def apply_filters(stream, filters, lexer=None):
assistant
#Here is the Python code you requested.

    """Use this method to apply an iterable of filters to
    a stream. If lexer is given it\s forwarded to the
    filter, otherwise the filter receives `None`.
    """
    def _apply(filter_, stream):
        for token in filter_.filter(lexer, stream):
            (yield token)
    for filter_ in filters:
        stream = _apply(filter_, stream)
    return stream