Selenium在Python中使用xpath选择一个元素

Question

I want to navigate to /yandsearch?... by clicking on the related links. There are two links in the page:

<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":{}}">

I try to select the first using:

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

It should click on the first item, but find_element_by_xpath can't find it.
I get the error:

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

I want to click on page 4 at this link yandex.by/yandsearch

I tried it also:

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

writes an error:

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

Your XPath is invalid, both criteria should be placed within the same square-brackets (formatted for readiblity) :

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

Not formatted version :

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