splinter：在iframe中找不到元素

Question

我試圖點擊http://www.dresslink.com/women-woolen-winter-trench-double-button-fur-collar-coat-p-9442.html 中名爲'Estimate Shipping Fee'的鏈接，該鏈接將打開一個iframe覆蓋圖，通過ajax提取內容並填充它。

這裏的代碼

from splinter import Browser 

browser = Browser('phantomjs') 

def extract(url): 
     browser.visit(url) 
     browser.find_by_css(".floatl.shipping_fee a").click() 
     browser.is_element_present_by_id('global_popup_login_iframe', wait_time=10) 
     with browser.get_iframe('global_popup_login_iframe') as iframe: 
       iframe.is_element_present_by_id('dyanmic_shipping_list', wait_time=10) 
       shippingprice = iframe.find_by_tag('img') 
       print shippingprice[1]['src'] 

extract('http://www.dresslink.com/women-woolen-winter-trench-double-button-fur-collar-coat-p-9442.html' 

的問題是，它似乎無法找到的iframe中的元素，我已經試過find_by_css，by_xpath，結果是一樣的。

splinter.exceptions.ElementDoesNotExist: no elements could be found with tag_name "img" 

確實存在一個img標記，但它找不到它。