解释:row = ((row & 0x00FF) << 8) | ((row & 0xFF00) >> 8);
时间: 2024-05-22 22:16:22 浏览: 24
+ 1) % len(grid)) if the current row is not the last row in the grid, otherwise it becomes the first row.
This code is using the modulo operator (%) to check if the current row is the last row in the grid. If it is not the last row, then it adds 1 to the row number and assigns the result to row. If it is the last row, then it assigns 0 (the first row) to row.
This code is useful when iterating through a 2-dimensional grid in a loop and you want to cycle through the rows. It ensures that the loop will continue from the first row after reaching the last row.
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解释以下代码:def calculateCRC(data): crc = 0 for dat in data: crc = (crc >> 8) | (crc << 8) crc ^= dat crc ^= (crc & 0xFF) >> 4 crc ^= crc << 12 crc ^= (crc & 0x00FF) << 5 crc &= 0xFFFF return crc
>> 4) & 0x0F00
crc ^= (crc << 8) << 4
crc ^= (crc & 0xFF00) << 4
crc &= 0xFFFF
return crc
这段代码是一个计算CRC(循环冗余校验)的函数。CRC是一种检验数据传输是否出错的方法,常用于网络传输、数据存储等场景。具体来说,该函数首先将CRC值初始化为0,然后对输入的数据逐个进行处理。每次处理都将当前的CRC值向右循环移动8位,并将当前数据字节异或到CRC值上。然后进行一系列异或、移位等操作,最终得到CRC值作为校验结果返回。
def crc(data): crc = 0 for dat in data: crc = (crc >> 8) | (crc << 8) crc ^= dat crc ^= (crc & 0xFF) >> 4 crc ^= crc << 12 crc ^= (crc & 0x00FF) << 5 crc &= 0xFFFF return crc
<< 3) crc ^= (crc >> 4) crc ^= (crc << 2) crc ^= (crc >> 14) crc ^= (crc << 10) crc &= 0xFFFF return crc请问这段代码是用来做什么的?
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