selenium為網頁中選擇框元素的獲取特別引入了一個Select物件，

引入物件的方式：

 from selenium.webdriver.support.ui import Select 

查詢文件可以知道 Select 所支援的方法：

class selenium.webdriver.support.select.Select(webelement)[source]
Constructor. A check is made that the given element is, indeed, a SELECT tag. If it is not, then an UnexpectedTagNameException is thrown.

Args :  
 
  
webelement - element SELECT element to wrap
Example:
from selenium.webdriver.support.ui import Select # 引入

Select(driver.find_element_by_tag_name(“select”)).select_by_index(2) # 獲取select元素

all_selected_options[source]
Returns a list of all selected options belonging to this select tag

deselect_all()[source]
Clear all selected entries. This 
 
is only valid when the SELECT supports multiple selections. throws NotImplementedError If the SELECT does not support multiple selections

deselect_by_index(index)[source]
Deselect the option at the given index. This is done by examing the “index” attribute of an element, and not merely by counting.

Args :    
index - The option at this index will be deselected
throws NoSuchElementException If there is no option with specisied index in SELECT

deselect_by_value(value)[source]
Deselect all options that have a value matching the argument. That is, when given “foo” this would deselect an option like:

<option value=”foo”>Bar</option>
Args :    
value - The value to match against
throws NoSuchElementException If there is no option with specisied value in SELECT

deselect_by_visible_text(text)[source]
Deselect all options that display text matching the argument. That is, when given “Bar” this would deselect an option like:

<option value=”foo”>Bar</option>

Args :    
text - The visible text to match against
first_selected_option[source]
The first selected option in this select tag (or the currently selected option in a normal select)

options[source]
Returns a list of all options belonging to this select tag

select_by_index(index)[source]
Select the option at the given index. This is done by examing the “index” attribute of an element, and not merely by counting.

Args :    
index - The option at this index will be selected
throws NoSuchElementException If there is no option with specisied index in SELECT
 


select_by_value(value)[source]
Select all options that have a value matching the argument. That is, when given “foo” this would select an option like:

<option value=”foo”>Bar</option>

Args :    
value - The value to match against
throws NoSuchElementException If there is no option with specisied value in SELECT

select_by_visible_text(text)[source]
Select all options that display text matching the argument. That is, when given “Bar” this would select an option like:

<option value=”foo”>Bar</option>
Args :    
text - The visible text to match against
throws NoSuchElementException If there is no option with specisied text in SELECT