小编Sno*_*wBG的帖子

我在使用CRCMOD库获取CCITT CRC16检查的Python 3.4中编写代码时遇到问题。

那就是我的字符串：

a731986b1500087f9206e82e3829fe8bcffed5555efd00a100980000010000000100000009010013bb1d001e287107009b3000000300000088330000f427500077026309

指定的crc值为1d7f

我的代码：

import crcmod

crc16 = crcmod.mkCrcFun(0x11021, 0x1d0f, False, 0x0000)

hex(crc16(b'a731986b1500087f9206e82e3829fe8bcffed5555efd00a100980000010000000100000009010013bb1d001e287107009b3000000300000088330000f427500077026309'))

返回：7d67

我究竟做错了什么？

我正在尝试了解 Python 3 上的线程。我制作了一个示例代码：

import time 
import threading

def myfunction(string,sleeptime,lock,*args):
  count = 0
  while count < 2:
    #entering critical section
    lock.acquire()
    print(string, " Now sleeping after Lock acquired for ",sleeptime)
    time.sleep(sleeptime)
    print(string, " Now releasing lock and sleeping again.\n",time.ctime(time.time()))
    lock.release()
    #exiting critical section
    time.sleep(sleeptime)
    count+=1
    #threading.Thread.daemon=True

if __name__!="__main__":
  lock = threading.Lock()
  try:
    threading.Thread.start(myfunction("Thread Nº 1",2,lock))
    threading.Thread.start(myfunction("Thread Nº 2",2,lock))
  except:
    raise

  while 1:pass

它部分起作用。当它到达 时while<2 loop，它返回错误：

Traceback (most recent call last):
  File "python", line 22, in <module>
AttributeError: 'NoneType' …