selenium中'WebElement' object is not iterable报错问题

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        -equiv="content-type"content="text/html;charset=utf-8"/>

        /title>

        type="text/javascript"async=""src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"><</CODE>/script>

        ="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css"rel="stylesheet"/>

        ="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"><</CODE>/script>

    <</CODE>/head>

checkbox<</CODE>/h3>

class="well">

class="control-group">

                    class="control-label"for="c1">checkbox1<</CODE>/label>

class="controls">

                        <</CODE>inputtype="checkbox"id="c1"/>

                    <</CODE>/div>

                <</CODE>/div>

class="control-group">

                    class="control-label"for="c2">checkbox2<</CODE>/label>

class="controls">

                        <</CODE>inputtype="checkbox"id="c2"/>

                    <</CODE>/div>

                <</CODE>/div>

class="control-group">

                    class="control-label"for="c3">checkbox3<</CODE>/label>

class="controls">

                        <</CODE>inputtype="checkbox"id="c3"/>

                    <</CODE>/div>

                <</CODE>/div>                     

class="control-group">

                    class="control-label"for="r">radio<</CODE>/label>

class="controls">

                        <</CODE>inputtype="radio"id="r"/>

                    <</CODE>/div>

                <</CODE>/div>                     

            <</CODE>/form>

        <</CODE>/div>

    <</CODE>/body>

<</CODE>/html>

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#coding=utf-8

from selenium importwebdriver

import time

import os

dr =webdriver.Firefox()

file_path = 'file:///' +os.path.abspath('checkbox.html')

dr.get(file_path)

# 选择所有的checkbox并全部勾上

checkboxes =dr.find_element_by_css_selector('input[type=checkbox]')

for check incheckboxes:

    check.click()

time.sleep(1)

# 打印当前页面上有多少个checkbox

dr.quit()