selenium下拉框选择

下拉框结构如下，我需要选择的是new：

html为：

<select id="condition_type" name="condition_type" class="notification-required notification-required-unknown">
	<option value="">
			- Select -</option>
	<option value="new, new">
			New</option>
	<option value="used, like_new">
			Used - Like New</option>
	<option value="used, very_good">
			Used - Very Good</option>
	<option value="used, good">
			Used - Good</option>
	<option value="used, acceptable">
			Used - Acceptable</option>
	<option value="refurbished, refurbished">
			Refurbished</option>
	</select>

代码：

from selenium.webdriver.support.select import Select
# 定位到下拉框，选择new
sel = browser.find_element_by_xpath("//select[@id='condition_type']")
Select(sel).select_by_value('new, new')