from xml.dom import minidom
import unittest
#######################################################################

class ReadXml(object):
    def ReadXml(self,filename,elementfirstnode,num,elementsecondnode):
        dom = minidom.parse(filename)
        root = dom.documentElement
        parnote = root.getElementsByTagName(elementfirstnode)[num]
        secondnote = parnote.getElementsByTagName(elementsecondnode)[0].childNodes[0].nodeValue
        return secondnote
    
    #def Send(self,send_cmd): 發送命令，表示發送這個命令
        #a,b = server.send_cmd(send_cmd)
        #
        #val[] = b[val]
        #return a,b
        
#P = ReadXml()
#m = P.ReadXml("/home/sct/s.xml", "testdata", 0, "send_cmd0")
#print m

class bruceLee(unittest.TestCase):
    def setUp(self):
        global P
        P = ReadXml() 
        print "start"
         
    def tearDown(self):
        
        print "exit"
    def testA(self):
        
        self.assertEqual("OK",P.ReadXml("/home/sct/s.xml", "testdata", 0, "act0"))
         
        #self.assertTrue(m.lujingzhi("id",yang.denglu2("xml.xml", "kejian1", 0,"shuxing0")).is_displayed())
unittest.main()

<?xml version="1.0" encoding="utf-8"?>
<api>
    <testdata>
        <send_cmd0></send_cmd0>
        <act0>OK</act0>
        <send_cmd1></send_cmd1>
        <act1>OK</act1>
        <send_cmd2></send_cmd2>
        <act2>OK</act2>
        <send_cmd3></send_cmd3>
        <act3>OK</act3>
        <send_cmd4></send_cmd4>
        <act4>OK</act4>
        <send_cmd5></send_cmd5>
        <act5>OK</act5>
        <send_cmd6></send_cmd6>
        <act6>OK</act6>
    </testdata>
</api>