#NEWLINE# def __init__( self , free_block ) : #NEWLINE# #INDENT# assert isinstance ( free_block , sbbf02 . BlockFree ) , 'Expected free block' #NEWLINE# self . data = free_block . raw_data [ : ( - 4 ) ] #NEWLINE# ( value , ) = struct . unpack ( '>i' , value . raw_data [ ( - 4 ) : ] ) #NEWLINE# self . next_block = ( value if ( value != ( - 1 ) ) else None )