Question

我正在使用mininet模拟器。我想每7秒向主机发送一次命令。我正在使用

threading.Timer()

在for循环中。我需要将参数作为变量传递给函数，该变量改变了循环中的每次迭代像这样

for ip in ips:
    t =threading.Timer(7, attacker.cmd ,args= ("sudo python SYN-ACK.py %s 192.168.1.100 %d 80",))%(ip,ips[ip])

然而，这给了我这个错误

 t =threading.Timer(7, attacker.cmd ,args= ("sudo python SYN-ACK.py %s 192.168.1.100 %d 80",))%(ip,ips[ip])
TypeError: unsupported operand type(s) for %: '_Timer' and 'tuple'

尝试上述解决方案后，我得到了这个例外

Exception in thread Thread-31:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 1082, in run
self.function(*self.args, **self.kwargs)
File "build/bdist.linux-x86_64/egg/mininet/node.py", line 355, in cmd
self.sendCmd( *args, **kwargs )
File "build/bdist.linux-x86_64/egg/mininet/node.py", line 272, in 
sendCmd
assert self.shell and not self.waiting
AssertionError

我怎么解决这个问题？

Answer 1

操作％必须在元组内部，最好将任务分开以使其更具可读性。：

for ip, port in ips.items():
    cmd = "sudo python SYN-ACK.py %s 192.168.1.100 %d 80" % (ip, port)
    t =threading.Timer(7, some_print,args= (cmd,))
    t.start()

在For循环中使用Timer（）

1 个答案: