Python机械化忽略控件表示只读

我正在尝试使用mechanize提交表单

这里是我的表单结构

<form class="pagin fr" name="formPage" action="/fetdata" id="topPagin" method="POST">

 <input id="dataicn" name="clust" value="" type="hidden"> 

 <input name="serialid" value="123" type="hidden">

 <button class="dir pgNext" type="button" name="pageNo" value=" 2"=""> &gt; </button>
</form>

请给我这个问题的解决办法

  <HiddenControl(clust=) (readonly)>
  <HiddenControl(serialid=123) (readonly)>
  <IgnoreControl(pageNo=<None>)>>

  AttributeError: control 'pageNo' is ignored, hence read-only


        pagecontrol3 = br_n.form.find_control("pageNo")
        pagecontrol3.readonly = False
        pagecontrol3.disabled = False
        pagecontrol3.disabled = True
        pagecontrol3.value = pageNo