python之类型错误 : can only concatenate list (not "int") to list

我正在尝试对以下代码中列表中的某些元素做一些有用的事情:

IPS=['10.254.243.83','10.254.243.82'] 
 
def commands(cmd): 
    command = Popen(cmd, shell=True, stdout=PIPE) 
    command_strip = command.stdout.read().strip() 
    print command_strip 
 
def main(): 
    for ip in IPS: 
        ping = call('ping -c 3 %s' % ip, shell=True) 
        commands(ping) 
 
if __name__ == "__main__": 
    main() 

然后，它返回给我: python 测试.py

PING 10.254.243.83 (10.254.243.83) 56(84) bytes of data. 
64 bytes from 10.254.243.83: icmp_seq=1 ttl=61 time=2.72 ms 
64 bytes from 10.254.243.83: icmp_seq=2 ttl=61 time=2.05 ms 
64 bytes from 10.254.243.83: icmp_seq=3 ttl=61 time=1.88 ms 
 
--- 10.254.243.83 ping statistics --- 
3 packets transmitted, 3 received, 0% packet loss, time 2004ms 
rtt min/avg/max/mdev = 1.885/2.224/2.728/0.363 ms 
 
Traceback (most recent call last): 
  File "teste.py", line 15, in ? 
    main() 
  File "teste.py", line 12, in main 
    commands(ping) 
  File "teste.py", line 5, in commands 
    command = Popen(cmd, shell=True, stdout=PIPE) 
  File "/usr/lib/python2.4/subprocess.py", line 543, in __init__ 
    errread, errwrite) 
  File "/usr/lib/python2.4/subprocess.py", line 891, in _execute_child 
    args = ["/bin/sh", "-c"] + args 
TypeError: can only concatenate list (not "int") to list 
 
Can someone help me with this error ? 

请您参考如下方法:

你传递的返回值

call('ping -c 3 %s' % ip, shell=True) 

作为您的commands() 函数的cmd 参数。提到的返回值是一个整数，作为命令没有任何意义，因此尝试使用 Popen() 执行此整数会按预期失败。