生成一个用python编写的动态分区算法

好的，以下是一个简单的动态分区算法的 Python 实现：

class MemoryAllocation:
    def __init__(self, memory_size):
        self.memory_size = memory_size
        self.free_blocks = [(0, memory_size)]

    def allocate(self, process_size):
        for i, block in enumerate(self.free_blocks):
            block_start, block_end = block
            block_size = block_end - block_start

            if block_size >= process_size:
                self.free_blocks.pop(i)
                if block_size > process_size:
                    self.free_blocks.insert(i, (block_start + process_size, block_end))
                return block_start

        return None

    def deallocate(self, start_address, process_size):
        end_address = start_address + process_size

        for i, block in enumerate(self.free_blocks):
            if end_address == block[0]:
                self.free_blocks[i] = (start_address, block[1])
                return
            elif start_address == block[1]:
                self.free_blocks[i] = (block[0], end_address)
                return
            elif block[0] < start_address < block[1]:
                self.free_blocks.pop(i)
                self.free_blocks.insert(i, (block[0], start_address))
                self.free_blocks.insert(i + 1, (end_address, block[1]))
                return

        self.free_blocks.append((start_address, end_address))
        self.free_blocks = sorted(self.free_blocks, key=lambda x: x[0])

上面的代码实现了 `MemoryAllocation` 类，它接受一个整数 `memory_size` 作为内存大小，初始化时将整个内存作为一个空闲块。`allocate(process_size)` 方法使用首次适应算法，从空闲块中找到第一个大小满足进程大小的块，并返回其起始地址。`deallocate(start_address, process_size)` 方法释放进程占用的内存，同时将空闲块合并。其中，如果释放的内存与前后相邻的空闲块可以合并，则进行合并。