human
Complete this python program:
def _triage_filter_params(x, sfreq, l_freq, h_freq, l_trans_bandwidth, h_trans_bandwidth, filter_length, method, phase, fir_window, fir_design, bands='scalar', reverse=False):
assistant
#Here is the Python code you requested.

    """Validate and automate filter parameter selection.
    """
    if ((not isinstance(phase, string_types)) or (phase not in ('linear', 'zero', 'zero-double', 'minimum', ''))):
        raise ValueError(('phase    must    be    "linear",    "zero",    "zero-double",    or    "minimum",    got    "%s"' % (phase,)))
    if ((not isinstance(fir_window, string_types)) or (fir_window not in ('hann', 'hamming', 'blackman', ''))):
        raise ValueError(('fir_window    must    be    "hamming",    "hann",    or    "blackman",got    "%s"' % (fir_window,)))
    if (fir_design is None):
        fir_design = 'firwin2'
        if (method != 'iir'):
            warn('fir_design    defaults    to    "firwin2"    in    0.15    but    will    change    to    "firwin"    in    0.16,    set    it    explicitly    to    avoid    this    warning.', DeprecationWarning)
    if ((not isinstance(fir_design, string_types)) or (fir_design not in ('firwin', 'firwin2'))):
        raise ValueError(('fir_design    must    be    "firwin"    or    "firwin2",    got    %s' % (fir_design,)))
    def float_array(c):
        return np.array(c, float).ravel()
    if (bands == 'arr'):
        cast = float_array
    else:
        cast = float
    x = np.asanyarray(x)
    len_x = x.shape[(-1)]
    sfreq = float(sfreq)
    if (l_freq is not None):
        l_freq = cast(l_freq)
        if np.any((l_freq <= 0)):
            raise ValueError(('highpass    frequency    %s    must    be    greater    than    zero' % (l_freq,)))
    if (h_freq is not None):
        h_freq = cast(h_freq)
        if np.any((h_freq >= (sfreq / 2.0))):
            raise ValueError(('lowpass    frequency    %s    must    be    less    than    Nyquist    (%s)' % (h_freq, (sfreq / 2.0))))
    if (method == 'iir'):
        (l_stop, h_stop) = (l_freq, h_freq)
    else:
        l_stop = h_stop = None
        if (l_freq is not None):
            if isinstance(l_trans_bandwidth, string_types):
                if (l_trans_bandwidth != 'auto'):
                    raise ValueError(('l_trans_bandwidth    must    be    "auto"    if    string,   ...