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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_erase_size(self, offset, size):
 """ Calculate an erase size given a specific size in bytes. Provides a workaround for the bootloader erase bug."""


        sectors_per_block = 16
        sector_size = self.FLASH_SECTOR_SIZE
        num_sectors = (size + sector_size - 1) // sector_size
        start_sector = offset // sector_size

        head_sectors = sectors_per_block - (start_sector % sectors_per_block)
        if num_sectors < head_sectors:
            head_sectors = num_sectors

        if num_sectors < 2 * head_sectors:
            return (num_sectors + 1) // 2 * sector_size
        else:
            return (num_sectors - head_sectors) * sector_size