在Python中使用Selenium通过xpath选择元素

Question

我想通过点击相关链接来导航到 /yandsearch?... 页面。这个页面上有两个链接：

<a class="button button_theme_pseudo button_pseudo-pressed_yes button_size_m button_counter_yes button_focus_no b-link b-link_pseudo_yes pager__button pager__button_kind_page i-bem button_js_inited" onmousedown="w(this, '405.88');" href="/yandsearch?lr=157&text=landsad&p=3" role="button" ondblclick="return {"button":{"counter":"w(this, '405.88');"},"b-link":{}}">
<a class="button button_theme_pseudo button_pseudo-pressed_yes button_size_m button_counter_yes button_focus_no b-link b-link_pseudo_yes pager__button pager__button_kind_page i-bem" onmousedown="w(this, '405.88');" href="/yandsearch?lr=157&text=landsad&p=3" role="button" ondblclick="return {"button":{"counter":"w(this, '405.88');"},"b-link":{}}">

我尝试用以下方法选择第一个链接：

driver.find_element_by_xpath(str('//*[contains(@href,"yandsearch?lr=157&text=landsad&p=3")] and [contains(@class,"button_js_inited")]')

理论上应该能点击第一个项目，但 find_element_by_xpath 却找不到它。
我收到了这个错误：

    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.InvalidSelectorException: Message: 'The given selecto......

我想在这个链接上点击第4页 yandex.by/yandsearch

我也尝试了这个：

//*[contains(@href,"yandsearch?lr=157&text=landsad&p=3") and contains(@class,"button_js_inited")]

结果出现了一个错误：

self.error_handler.check_response(response) File "C:\Python34\lib\site- packages\selenium\webdriver\remote\errorhandler.py" , 
line 164, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.NoSuchElementException: 
Message: 'Unable to locate element: {"method":"xpath","selector":"//* [contains(@href,\\"yandsearch?lr=157&tex t=landsad&p=3\\") and contains(@class,\\"button_js_inited\\")]"}';

Answer 1

你的XPath写得不对，两个条件应该放在同一对方括号里（为了更好阅读，下面是格式化后的版本）：

//*[
        contains(@href,"yandsearch?lr=157&text=landsad&p=3") 
            and 
        contains(@class,"button_js_inited")
   ]

没有格式化的版本：

//*[contains(@href,"yandsearch?lr=157&text=landsad&p=3") and contains(@class,"button_js_inited")]