我在python2中使用了硒。我想使用（driver.find_elements_by_class_name（））查找一个元素，但是该代码没有结果。但是，如果尝试使用（driver.find_element_by_class_name（））查找元素，则会收到错误消息。
这是我的一些代码：
def test():
driver.get('https://mbasic.facebook.com/aldhy.tompo')
button_lainnya = driver.find_element_by_link_text('Lainnya')
Class = button_lainnya.get_attribute('class')
print Class
all_button = driver.find_elements_by_class_name(Class)
print all_button
test()
输出为：
cr cs
[]
如果我修改了第6行中的代码
all_button = driver.find_element_by_class_name(Class)
我收到错误消息：
Traceback (most recent call last):
File "c:/Users/LENOVO/OneDrive/Documents/project/python/Selenium/robot olshop.py", line 119, in <module>
test()
File "c:/Users/LENOVO/OneDrive/Documents/project/python/Selenium/robot olshop.py", line 114, in test
pesan = driver.find_element_by_class_name(element)
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 564, in find_element_by_class_name
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 978, in find_element
'value': value})['value']
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
self.error_handler.check_response(response)
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: .cr cs
这是网站的来源：
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<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>ALdhy</title><meta name="referrer" content="origin-when-crossorigin" id="meta_referrer" /><style type="text/css">/*<![CDATA[*/.cz{background:#fff;}.db{background:#e9ebee;}.dj{position:relative;top:1px;}.b .dc{padding:0;}.b .w{padding:2px;}.b .dg{padding:4px;}.dz{color:#4b4f56;}.dv{color:#1d2129;}.du{font-size:14px;line-height:20px;}.dk{font-size:16px;line-height:20px;}.ba{font-weight:normal;}.da{font-weight:bold;}.b .df{border-collapse:collapse;margin:0;width:100%;}.b td.di{border:0;padding:6px 0 6px 6px;vertical-align:middle;}.b .df .dl{padding:6px 6px 6px 0;text-align:right;white-space:nowrap;}.b .dh{padding:6px;}.b .m{border:0;border-collapse:collapse;margin:0;padding:0;width:100%;}.b .m tbody{vertical-align:top;}.b .em>tr>td,.b .em>tbody>tr>td,.b .m td.em{vertical-align:middle;}.b .m td{padding:0;}.b .m 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.bz{text-align:center;}.bx{background-color:#fff;}.i{background-color:#3b5998;}.cx{background-color:#d8dfea;border-top:solid 1px #3b5998;}.j{padding:2px 3px;}.ee{padding:4px 3px;}.by{padding:6px 3px;}.b a,.b a:visited{color:#3b5998;text-decoration:none;}.b .cu,.b .cu:visited{color:#6d84b4;}.b .bg,.b .bg:visited{color:#fff;}.b a:focus,.b a:hover,.b .cu:focus,.b .cu:hover{background-color:#3b5998;color:#fff;}.b .bg:focus,.b .bg:hover{background-color:#fff;color:#3b5998;}.ci{color:gray;}.ch{font-size:small;}body,tr,input,textarea,.f{font-size:medium;}.dt{padding-left:4px;}.cj .cl{display:inline-block;margin-right:4px;}.b .cj .cl{float:left;}.b .cj .cm{display:table-cell;}.s{border:0;display:inline-block;vertical-align:top;}i.s u{position:absolute;width:0;height:0;overflow:hidden;}.dw{margin-right:4px;}.co{clear:both;}.dr{border-radius:50%;}.cc{background:#eceff5;}.cf{margin:2px 0 0 5px;}.cq .cr{display:block;}.cr{border:solid 2px;cursor:pointer;margin:0;padding:2px 6px 3px;text-align:center;}.cs,.b a.cs{background:#f3f4f5;border-color:#ccc #aaa #999;color:#505c77;}.i .cs,.b .i a.cs{background:#3b5998;border-color:#8a9ac5 #29447E #1a356e;color:#fff;}.cr .s{pointer-events:none;}.cr{display:inline-block;}.cr+.cr{margin-left:3px;}.cr input{background:none;border:none;margin:0;padding:0;}.cs input{color:#505c77;}.i .cs input{color:#fff;}.bv{background:#f2f2f2;}.bp:hover .bv{background:none;}body{text-align:left;direction:ltr;}body,tr,input,textarea,button{font-family:sans-serif;}body,p,figure,h1,h2,h3,h4,h5,h6,ul,ol,li,dl,dd,dt{margin:0;padding:0;}h1,h2,h3,h4,h5,h6{font-size:1em;font-weight:bold;}ul,ol{list-style:none;}article,aside,figcaption,figure,footer,header,nav,section{display:block;}.e #viewport{margin:0 auto;max-width:600px;}#page{position:relative;}.r,.r.s{display:block;}.o{display:block;}.p{height:20px;width:20px;}.k{background:#3b5998;padding:0 4px 4px;height:22px;}.k.k .x{background:#fff;border:1px solid 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solid;border-color:#8d949e;border-radius:4px;display:block;margin-top:8px;padding:4px;text-align:center;}.eu{display:block;font-size:x-small;margin:-3px -3px 1px -3px;padding:3px;}.b .ef td.et{padding-right:4px;}.b .ef td.ev{padding-left:4px;}.ef.eg{background-color:#444950;}.eg{border-top:1px solid #444950;color:#bec3c9;}.b .eg a,.b .eg a:visited{color:#bec3c9;}.b .eg a:focus,.b .eg a:hover{background:#dadde1;color:#1d2129;}.ei{margin-bottom:8px;}.ef.eg .ei>table{background:#d3d7dc;border:1px solid #444950;}.ep{background:#d3d7dc;}.eh .es{height:24px;line-height:24px;margin-left:2px;}.ek{background:#fff;}.eh .eq{background-color:transparent;color:#4b4f56;display:block;padding:0;width:100%;}.el .s{display:block;}.eh .ej .er{padding:2px;}.eh .ej .el{padding:4px;}.b .eh .ej{border:1px solid #8d949e;}.be{padding-bottom:1px;}.bf{display:inline-block;font-size:small;padding:2px 4px 2px;}.bh{color:#fff496;}.b a:hover .bh,.b a:focus .bh,.bf:hover .bh,.bf:focus .bh{color:#365899;}/*]]>*/</style><link rel="manifest" href="/data/manifest/" crossorigin="use-credentials" /></head><body tabindex="0" class="b c d e"><div class="f"><div id="viewport"><div class="g h" id="MChromeHeader"><div class="i j" role="banner" id="header"><form method="get" action="/search/" class="k l"><input type="hidden" name="search" value="Search" /><input type="hidden" name="search_source" value="top_nav" /><table class="m" role="presentation"><tbody><tr><td class="n"><a class="o p q" href="/home.php?ref_component=mbasic_home_logo&ref_page=%2Fwap%2Fprofile_timeline.php%3Ainfo"><img src="https://static.xx.fbcdn.net/rsrc.php/v3/ym/r/Gjhrhb7r0lb.png" width="20" height="20" class="r s" alt="Facebook logo" /></a></td><td class="t u"><input class="v w x" name="query" placeholder="Cari Facebook" autocomplete="off" autocorrect="off" spellcheck="false" type="text" /></td><td class="n y"><input value="Cari" type="submit" class="z ba bb bc bd" 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/></a></div></div></div><div class="bw bx by"><div><div class="bz"><div class="ca cb"><a href="/photo.php?fbid=697134654117024&id=100014614866494&set=a.107340373096458" id="u_0_2"><img src="https://scontent.fcgk24-1.fna.fbcdn.net/v/t1.0-1/cp0/e15/q65/c12.0.74.74a/p74x74/75398266_697134660783690_3381090451179175936_o.jpg?_nc_cat=108&efg=eyJpIjoiYiJ9&_nc_oc=AQld6oI7W4qR3K81zygg6KwiL5nJZ6y9jfi6rXSIsxp7HS88TiAUeSdI74KcjIKilhw&_nc_ht=scontent.fcgk24-1.fna&oh=386b6fde17bfcd7fbaaf5308b54e7f89&oe=5E4AF13B" class="cc s" alt="ALdhy" /></a></div></div><span><div class="cd"><span><strong class="ce">ALdhy <span class="alternate_name">(Tompo)</span></strong><img src="https://static.xx.fbcdn.net/rsrc.php/v3/yK/r/Ye1TQi63ARL.png" width="8" height="12" class="cf cg s" aria-label="ALdhy dapat dihubungi melalui teleponnya" /></span></div><span class="ch ci"><span><div class="cj ck" role="heading" id="u_0_1"><img src="https://static.xx.fbcdn.net/rsrc.php/v3/yS/r/1HRQT0OcHKI.png" width="12" height="14" class="cl s" role="presentation" aria-level="4" /><span class="cm ch">Bekerja di <a class="cn" href="/profile.php?id=107980922563405">Swasta</a></span><div class="co"></div></div></span></span></span></div></div><div class="cp"><table class="cq"><tr><td><a href="/a/mobile/friends/profile_add_friend.php?subjectid=100014614866494&istimeline=1&hf=profile_button&fref=gm&frefid=0&referrer_uri=https%3A%2F%2Fmbasic.facebook.com%2Fbrowse%2Fgroup%2Fmembers%2F%3Fid%3D1536129013327270%26start%3D0%26listType%3Dlist_nonfriend_nonadmin%26refid%3D18%26ref%3Ddbl&gfid=AQBcZDwrl6y7AaxA" class="cr cs">Tambah Jadi Teman</a></td><td><a href="/messages/thread/100014614866494/?entrypoint=profile_message_button" class="cr cs">Pesan</a></td><td><a href="/mbasic/more/?owner_id=100014614866494" class="cr cs">Lainnya</a></td></tr></table></div><div class="ct f ci"><a href="/aldhy.tompo?v=timeline&lst=100003433068177%3A100014614866494%3A1573644042" class="cu">Linimasa</a> · <a href="/aldhy.tompo/friends?lst=100003433068177%3A100014614866494%3A1573644042" class="cu">Teman</a> · <a href="/aldhy.tompo/photos?lst=100003433068177%3A100014614866494%3A1573644042" class="cu">Foto</a> · <a href="/aldhy.tompo?v=likes&lst=100003433068177%3A100014614866494%3A1573644042" class="cu">Suka</a></div></div><div class="cv"><div class="cw bx"><h3 class="cx j">Teman</h3></div><div><div class="bx"><a href="/aldhy.tompo/friends?lst=100003433068177%3A100014614866494%3A1573644042">Lihat Semua Teman (1040)</a></div></div></div><div class="cy"><div id="work"><div class="cz"><div class="da db dc dd de"><table class="df dg"><tr><td class="t dh di" aria-hidden="false"><div class="dj" role="heading" tabindex="0"><span class="dk">Pekerjaan</span></div></td><td class="t dl di"><div></div></td></tr></table></div><div class="dm dn"><div class="do dp" id="u_0_0"><div class="cj dq"><a class="cl" href="/profile.php?id=107980922563405"><img src="https://scontent.fcgk24-1.fna.fbcdn.net/v/t1.0-1/cp0/e15/q65/c14.0.48.48a/p48x48/399548_10149999285987789_1102888142_n.png.jpg?_nc_cat=1&efg=eyJpIjoiYiJ9&_nc_oc=AQl8gYxpUBwBm01VIUkCjywHWgrHloJpYkVJY8bXRaDXHJWwKfRiC-GVvrpLBOvO3tU&_nc_ht=scontent.fcgk24-1.fna&oh=d390e65f185dc2fae2c2bbec1e845648&oe=5E60DEE1" class="dr ds cc s" alt="Swasta" /></a><div class="dt cm"><div><span class="du dv da dw"><a class="cn" href="/profile.php?id=107980922563405">Swasta</a></span></div></div><div class="co"></div></div></div></div></div></div></div><div id="contact-info"><div class="cz"><div class="da db dc dd de"><table class="df dg"><tr><td class="t dh di" aria-hidden="false"><div class="dj" role="heading" tabindex="0"><span class="dk">Info Kontak</span></div></td><td class="t dl di"><div></div></td></tr></table></div><div class="dm dn"><div class="do dp dx" title="Facebook"><table cellspacing="0" cellpadding="0" class="dy"><tr><td valign="top"><div class="dz ea"><span class="dk dz ba">Facebook</span></div></td><td valign="top" class="eb"><div class="ec"> /aldhy.tompo</div></td></tr></table></div></div></div></div><div id="basic-info"><div class="cz"><div class="da db dc dd de"><table class="df dg"><tr><td class="t dh di" aria-hidden="false"><div class="dj" role="heading" tabindex="0"><span class="dk">Info Umum</span></div></td><td class="t dl di"><div></div></td></tr></table></div><div class="dm dn"><div class="do dp dx" title="Jenis Kelamin"><table cellspacing="0" cellpadding="0" class="dy"><tr><td valign="top"><div class="dz ea"><span class="dk dz ba">Jenis Kelamin</span></div></td><td valign="top" class="eb"><div class="ec">Laki-laki</div></td></tr></table></div></div></div></div><div id="nicknames"><div class="cz"><div class="da db dc dd de"><table class="df dg"><tr><td class="t dh di" aria-hidden="false"><div class="dj" role="heading" tabindex="0"><span class="dk">Nama Lain</span></div></td><td class="t dl di"><div></div></td></tr></table></div><div 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因此，有人可以帮助我解决此问题吗？如何找到“ cr cs”类中的所有元素？如果我只想在类“ cr cs”中找到一个元素，以及如何解决该问题？
调用会button_lainnya.get_attribute('class')返回该元素的类列表，该列表具有两个用空格字符分隔的类。
对get_element_by_class_name(Class)Expects的调用将被赋予一个单一的类名称---“ cr”或“ cs”，但不能同时使用两者。
如果您需要同时使用两个类名来查找元素，则需要使用CSS选择器：
driver.find_element_by_css_selector(".cr.cs")
我的python有点生锈，但这应该可以工作：
selector = "." + Class.replace(" ", ".")
driver.find_element_by_css_selector(selector)
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