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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 low_frequency_cutoff_from_cli(opts):
 """Parses the low frequency cutoff from the given options. Returns ------- dict Dictionary of instruments -> low frequency cutoff. """

    # FIXME: this just uses the same frequency cutoff for every instrument for
    # now. We should allow for different frequency cutoffs to be used; that
    # will require (minor) changes to the Likelihood class
    instruments = opts.instruments if opts.instruments is not None else []
    return {ifo: opts.low_frequency_cutoff for ifo in instruments}