def okayAt63(level, pos):
 return ((level.blockAt(pos[0], 63, pos[2]) != 0) or (level.blockAt(pos[0], 64, pos[2]) != 0))

def okayAt63 ( level , pos ) : return ( ( level . blockAt ( pos [ 0 ] , 63 , pos [ 2 ] ) != 0 ) or ( level . blockAt ( pos [ 0 ] , 64 , pos [ 2 ] ) != 0 ) )
blocks 63 or 64 must be occupied .