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32.5. BandNoField.flatten()

This method, a required part of the FieldItem interface, outputs the band number as a flat field. It is a static method, and if passed None, it will generate a string of spaces of the correct length.
# - - -   B a n d N o F i e l d . f l a t t e n   - - -   Static

    def flatten(bandNo):
        '''Return a flat-field band number.
        if  bandNo is None:
            return BLANK_BAND_NO
            return bandNo.value