def get_single_band(fnames,band_numbers,band_num):
    """
    Function to return the file path for a single band, given a band number and
    list of input file paths.

    Parameters
    ----------
    fnames : LIST
        List of band file locations, as generated by get_filenames().
    band_numbers : LIST
        List of loaded band numbers.
    band_num : INT
        Numerical value corresponding to a Landsat-8 band.

    Returns
    -------
    STRING
        Returns a string containing the corresponding file path to the input 
        band_num value.

    """
    i = band_numbers.index(str(band_num))
    
    return fnames[i]