一点其他小巧

一,类的自动进出

class sth(object):
    def __init__(self,hehe):
        self.a = hehe
    def __enter__(self):
        print "进入类中"
        return self.a
    def __exit__(self, exc_type, exc_val, exc_tb):
        print "退出类"
with sth() as s: # s为 enter的返回
    print s

二， tread 与 treading

import thread,threading
def print_time(threadName, delay):
    count = 0
    while count < 5:
        time.sleep(delay)
        count += 1
        print "%s : %s" % (threadName, time.ctime(time.time()))

try:
    threading._start_new_thread(print_time, ("Thread-1", 2))
    thread.start_new_thread(print_time, ("Thread-2", 4))
except:
    print "Error:unable to start thread"
while 1:
    pass

三，SSH 链接管理 paramiko

C:\>pip install paramiko
Collecting paramiko
  Downloading paramiko-2.1.1-py2.py3-none-any.whl (172kB)
    100% |████████████████████████████████| 174kB 140kB/s

Successfully installed cffi-1.9.1 cryptography-1.7.2 enum34-1.1.6 idna-2.2 ipaddress-1.0.18 paramiko-2.1.1 pyasn1-0.2.2 pycparser-2.17

       import paramiko

def ssh2(ip,user,passwd,cmd):
    try:
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(ip,22,user,passwd,timeout=5)
        stdin,stdout,stderr = ssh.exec_command(cmd)
        stdin.write("Y") #简单交互输入
        print stdout.read()
        for x in stdout.readlines():
            print x.strip("\n")
        print '%s\tOK\n'%(ip)
        ssh.close()
    except:
        print '%s\tError\n'%(ip)

#ssh2()
con = ssh2('172.18.107.223','root','xxx',"hostname")

结果:
Connected to pydev debugger (build 143.1919)
linux-SUSE

172.18.107.223    OK


进程已结束,退出代码0