Selenium python如何等待元素创建

在页面上，我具有表导出列表元素，该元素会在几秒钟到几分钟（待处理，正在处理和已完成）之后更改，或者进度条已100％完成。从：

<p id="2c92c0f953cfa2d80153e8409eggFeb9" class="ares_txt15">  Pending  </p> </td>

至：

<p id="22c92c0f953cfa2d80153e6404bcc12c2" class="ares_txt15">  Completed                                                          
<script type="text/javascript"> var newPro0 = new ProgressBar('100'-0).appendTo('2c92c08653cf9ce60153e6cde69d57da'); </script>
<div class="iblock" style="vertical-align: middle; padding-left: 5px;">
<div class="iblock" style="width: 80px; height: 8px; border: 1px solid rgb(153, 153, 153); padding: 1px; font-size: 0px; vertical-align: middle; line-height: 0px;">
<div class="iblock" style="width: 80px; height: 8px; background: rgb(115, 194, 56) none repeat scroll 0% 0%; vertical-align: middle; font-size: 0px; line-height: 0px;"/>
</div>
<span class="iblock" style="padding: 0px 5px; line-height: 11px; vertical-align: middle;">100%</span>
</div>
</p

这就是我所拥有的：

 >>> all_data = browser.find_elements_by_xpath("//*[@class='ares_txt15']")
    >>> for row in all_data:
        print(row.text)

    Pending
    Completed 100%
    Completed 100%
    Completed 100%
    Completed 100%
    Completed 100%

        try:
            WebDriverWait(browser, 80).until(EC.presence_of_element_located((By.XPATH, '//*[@class="ares_text15" and contains(text(), "Completed 100%")]')))
        except TimeoutException:
            raise Exception('Unable to find text in this element after waiting 80 seconds')



        Traceback (most recent call last):
          File "<pyshell#56>", line 4, in <module>
            raise Exception('Unable to find text in this element after waiting 80 seconds')
        Exception: Unable to find text in this element after waiting 80 seconds