我通过读取excel的输入并调用python方法来执行步骤，从而编写了用于自动化测试的机器人。在python中，我使用xpath查找文本的/ td。这是我的脚本，
def accounts_populate_filtros(self, str_name, bln_edit = False):
path = ("(//* [contains(text(),'%s')]/ancestor::table[@id='ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFilters']/descendant::input/..)"% str(str_name))
selected_element = WebDriverWait(self.driver, 20).until(EC.presence_of_element_located((By.XPATH, path)))
WebDriverWait(self.driver, 20).until(EC.presence_of_element_located((By.XPATH, path)))
self.accounts_list_checkbox_select(selected_element, bln_edit)
在该参数处，机器人将读取excel文件并传递要为变量“ str_name”查找的文本。使用此功能后，它将调用“ accounts_list_checkbox_select”以查找自己的复选框并打勾，此功能可以正常工作。
这是我要测试的Web代码。我要引用的文本是“ Branch TH1”。
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<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter" class="ajax__tab_panel" style="visibility: visible;">
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_upEditViewFilters">
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_pFilterTabContent" style="height:350px;width:570px;">
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_pScopesControl">
<table style="width: 500px">
<tbody><tr>
<td align="right">
<span id="ctl00_ContentPlaceHolder_tcUser_tpFilter_lblApplication">Aplicación:</span>
</td>
<td align="left">
<select name="ctl00$ContentPlaceHolder$tcUser$tpFilter$ddlApplication" onchange="javascript:setTimeout('__doPostBack(\'ctl00$ContentPlaceHolder$tcUser$tpFilter$ddlApplication\',\'\')', 0)" id="ctl00_ContentPlaceHolder_tcUser_tpFilter_ddlApplication">
<option selected="selected" value="2">Aplicacion caja registradora.</option>
<option value="4">Aplicacion de Dashboard para Transactional Switch</option>
<option value="3">Aplicacion de partner portal.</option>
<option value="6">Aplicacion Prueba Symetric</option>
<option value="1">Aplicacion web central.</option>
<option value="5">Aplicación WebTeller</option>
</select>
</td>
</tr>
<tr>
<td align="right">
<span id="ctl00_ContentPlaceHolder_tcUser_tpFilter_lblScope">Alcance:</span>
</td>
<td align="left">
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_upEditViewFiltersScopes">
<select name="ctl00$ContentPlaceHolder$tcUser$tpFilter$ddlScope" onchange="javascript:setTimeout('__doPostBack(\'ctl00$ContentPlaceHolder$tcUser$tpFilter$ddlScope\',\'\')', 0)" id="ctl00_ContentPlaceHolder_tcUser_tpFilter_ddlScope">
<option value="6">Instancia de Aplicación</option>
<option selected="selected" value="4">Agencia</option>
<option value="5">Caja</option>
<option value="3">Cadena</option>
<option value="1">Operación</option>
<option value="2">Proveedor</option>
<option value="7">DES scope de prueba 2</option>
</select>
</div>
</td>
</tr>
</tbody></table>
</div>
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_pScopesChecks" style="text-align:left;">
<table border="0" style="border-collapse: collapse; height: 25px; width: 100%;">
<tbody><tr>
<td align="left">
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_upEditViewFiltersFilterEnabledControls">
<input id="ctl00_ContentPlaceHolder_tcUser_tpFilter_rbScopeFilterEnabled" type="radio" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$rbScopeFilterStatus" value="rbScopeFilterEnabled" checked="checked"><label for="ctl00_ContentPlaceHolder_tcUser_tpFilter_rbScopeFilterEnabled">Habilitar</label>
<input id="ctl00_ContentPlaceHolder_tcUser_tpFilter_rbScopeFilterDisabled" type="radio" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$rbScopeFilterStatus" value="rbScopeFilterDisabled" onclick="javascript:setTimeout('__doPostBack(\'ctl00$ContentPlaceHolder$tcUser$tpFilter$rbScopeFilterDisabled\',\'\')', 0)"><label for="ctl00_ContentPlaceHolder_tcUser_tpFilter_rbScopeFilterDisabled">Inhabilitar</label>
</div>
</td>
<td align="right">
<input name="ctl00$ContentPlaceHolder$tcUser$tpFilter$txtScopeSearch" type="text" id="txtScopeSearch" maxlength="50" style="width: 200px;" onkeyup="window.ManageUser.EditView.eventHandlers.txtScopeSearch_OnKeyPress(this, event)" onkeydown="window.ManageUser.EditView.eventHandlers.txtScopeSearch_OnKeyPress(this, event)" value="Branch TH1">
<input type="submit" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$btnScopeSearch" value="Buscar" id="btnScopeSearch" style="width:60px;">
</td>
</tr>
</tbody></table>
<div id="ctl00_ContentPlaceHolder_tcUser_tpFilter_upEditViewFiltersFilterList">
<table border="0" style="border-collapse: collapse; height: 310px; width: 100%;">
<tbody><tr>
<td colspan="2">
<div style="height: 285px; overflow-y: scroll;">
<table id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFilters" style="font-size:XX-Small;">
<tbody><tr>
<td><input id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFilters_0" type="checkbox" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$cblScopeFilters$0" onclick="javascript:setTimeout('__doPostBack(\'ctl00$ContentPlaceHolder$tcUser$tpFilter$cblScopeFilters$0\',\'\')', 0)" value="8121"><label for="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFilters_0">Branch TH1</label></td><td></td>
</tr>
</tbody></table>
</div>
</td>
</tr>
<tr style="height: 24px;">
<td colspan="2">
<table align="center" width="350px">
<tbody><tr>
<td align="left" style="width: 50px;">
<input type="image" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$cblScopeFiltersPager$lbtFirst" id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFiltersPager_lbtFirst" disabled="disabled" class="aspNetDisabled" src="../Images/first2.png">
</td>
<td align="left" style="width: 50px;">
<input type="image" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$cblScopeFiltersPager$lbtPrevious" id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFiltersPager_lbtPrevious" disabled="disabled" class="aspNetDisabled" src="../Images/previous2.png">
</td>
<td align="center" style="width: 150px;">
<span id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFiltersPager_lblPageCounter">Page 1/1</span>
</td>
<td align="right" style="width: 50px;">
<input type="image" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$cblScopeFiltersPager$lbtNext" id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFiltersPager_lbtNext" disabled="disabled" class="aspNetDisabled" src="../Images/next2.png">
</td>
<td align="right" style="width: 50px;">
<input type="image" name="ctl00$ContentPlaceHolder$tcUser$tpFilter$cblScopeFiltersPager$lbtLast" id="ctl00_ContentPlaceHolder_tcUser_tpFilter_cblScopeFiltersPager_lbtLast" disabled="disabled" class="aspNetDisabled" src="../Images/last2.png">
</td>
</tr>
</tbody></table>
</td>
</tr>
</tbody></table>
</div>
</div>
</div>
</div>
</div>
实际上一次有很多输入，因此，根据excel的输入，此功能将被选择为每个机器人运行多次。但是当我跑步时，我发现它在此行随机失败，
selected_element = WebDriverWait(self.driver, 20).until(EC.presence_of_element_located((By.XPATH, path)))
错误显示在这里，
StaleElementReferenceException: Message: stale element reference: element is not attached to the page document
我不认为xpath是错误的，因为正如我所说，它是随机失败并通过的。每次运行时，它总是在此代码行失败，但输入不同。有时，某些输入运行通过，但是在不同的时间运行，该输入运行因上面的错误而失败。它有线。请帮忙。