Python subprocess.call() and Popen()

import subprocess
#import test
#callcmd = "test.py";
callcmd2 = "AdobePatchInstaller.exe --mode=silent";
callcmd = "full.bat";
callcmdun = "fullun.bat";

def openProcess(callcmd):
   
    try:
        process = subprocess.Popen(callcmd,shell=True,stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE);
        #print process.communicate();
        print "----------------";
        while process.poll() == None:
            line = process.stdout.readline();
        print "---Exit code is :"+str(process.poll())+"---"
        retcode =  process.poll();
        if retcode == 0:
            print "---install successfully---"
        #print subprocess.check_call(callcmd, shell=True,stderr=subprocess.STDOUT);
    except Exception,e:
        print str(e);
        pass
    #process.stdin.write("send to test from call");
   
    #print "stdoutdata is : "+str(stdoutdata) + ",stderrdata is : "+str(stderrdata);
openProcess(callcmd);

def callProcess(callcmd):
   
    try:
        process = subprocess.call(callcmd,shell=True,stdin=subprocess.PIPE,stdout=subprocess.PIPE, stderr=subprocess.PIPE);
        print "---Exit code is :"+str(process)+"---"
        if process== 0:
            print "---install successfully---"

    except Exception,e:
        print str(e);
        pass
    #process.stdin.write("send to test from call");
   
    #print "stdoutdata is : "+str(stdoutdata) + ",stderrdata is : "+str(stderrdata);
callProcess(callcmdun)