pexpect 子进程存活检查

import pexpect,time         
                   
class s_p():                
    def star_commd(self, cm):    
        self.p = pexpect.spawn(cm)           
                   
    def check_p(self):      
        print "is alive %s" % self.p.isalive()
                   
                   
if __name__=="__main__":    
    x = s_p()               
    x.star_commd("ls")      
    while 1:                
        x.check_p()         
        time.sleep(5) 

add:http://nullege.com/codes/search/pexpect.spawn.kill