selenium 經常使用api

'''
驅動對象　　 http://selenium-python.readthedocs.io/ 
    browser = webdriver.Chrome()
    browser = webdriver.Firefox()
    browser = webdriver.Edge()
    browser = webdriver.PhantomJS()
    browser = webdriver.Safari()
                            ....等
訪問頁面
    browser = webdriver.Chrome()
    browser.get('https://www.taobao.com')
    print(browser.page_source)  打印源碼
    browser.close()    關閉遊覽器
查找元素
    單個元素
        from selenium import webdriver
        browser = webdriver.Chrome()
        browser.get('https://www.taobao.com')
        # 4 種方式等價
        input_by_id = browser.find_element(By.ID,'q') 查找id 爲q  By.ID,By.CSS_SELECTOR
        input_first = browser.find_element_by_id('q') 查找id 爲q
        input_second = browser.find_element_by_css_selector('#q')  jq的方法查找id="q"
        input_third = browser.find_element_by_xpath('//*[@id="q"]')
        print(input_first, input_second, input_third)
        browser.close()
    查找多個元素
        from selenium import webdriver
        browser = webdriver.Chrome()
        browser.get('https://www.taobao.com')
        # 第一
        lis = browser.find_elements_by_css_selector('.service-bd li')  # 選擇service-bd 下的 li元素
        # 2
        lis = browser.find_elements(By.CSS_SELECTOR,'.service-bd li')  # 等價的
        print(lis)
        browser.close()
    ...
        find_elements_by_name
        find_elements_by_xpath
        find_elements_by_tag_name
        find_elements_by_class_name
        find_elements_by_css_selector
    元素交互操做
        from selenium import webdriver
        import time
        browser = webdriver.Chrome()
        browser.get('https://www.taobao.com')
        input = browser.find_element_by_id('q')
        input.send_keys('iPhone')
        time.sleep(1)
        input.clear()
        input.send_keys('iPad')
        button = browser.find_element_by_class_name('btn-search')
        button.click()
    執行javascript
        from selenium import webdriver
        browser = webdriver.Chrome()
        browser.get('https://zhihu.com/explore')
        browser.execute_script('window.scrollTo(0,document.body.scrollHeight)')
        browser.execute_script('alert('To Botton')')
    獲取屬性
        logo = browser.find_element_by_id('zh-top')
        print(logo)
        print(logo.get_attribute('class'))  # 打印class屬性
    獲取文本值
        input = browser.find_element_by_class_name('zu-top')
        print(input.text)
    獲取ID,位置,標籤名,大小
        input.id
        input.location  # {y:'',x:''}
        input.tag_name  # button
        input.size      # {'height': 22,'width':11}

'''
#     元素交互操做
'''
from selenium import webdriver
import time
browser = webdriver.Chrome()
browser.get('https://taobao.com')
input = browser.find_element_by_id('q')
input.send_keys('iPhone')
time.sleep(1)
input.clear()
input.send_keys('iPad')
button = browser.find_element_by_class_name('btn-search')
button.click()
'''
#  執行javascript
'''
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://zhihu.com/explore')
# 滾到底部
browser.execute_script('window.scrollTo(0,document.body.scrollHeight)')
# 彈框
browser.execute_script('alert("I love You")')
'''
# iFrame 切換使用(頁面內的iframe)
'''
import time
from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
browser = webdriver.Chrome()
url = 'http://www.runoob.com/try/try.php?filename=jqueryui-api-droppable'
browser.get(url)
browser.switch_to.frame('iframeResult')  # 切換到這個iframe
source = browser.find_element_by_css_selector('#draggable')
print(source)
try:
    # 在網頁的iframe中不能 查找當前iframe以外的元素,須要切換
    logo = browser.find_element_by_class_name('logo')
# except:
except NoSuchElementException as e:
    print('No Logo')
# 切換iframe (切換到父iframe)
browser.switch_to.parent_frame()
logo = browser.find_element_by_class_name('logo')
print(logo)
print(logo.text)
'''
# 等待...
# 隱士等待
'''
from selenium import webdriver
browser = webdriver.Chrome()
browser.implicitly_wait(10)  # 當沒有找到元素,會等10秒在進行查找,若是有就不會等
browser.get('https://www.zhihu.com/explore')
input = browser.find_element_by_class_name('zu-top-add-question')
print(input)
'''
# 顯示等待
'''
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
wait = WebDriverWait(browser, 10)
input = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, '.btn-search')))
print(input)
'''
''' 顯示等待的條件
http://selenium-python.readthedocs.io/installation.html
title_is  標題是某內容
title_contains 標題包含某內容
presence_of_element_located((By.ID,'p')) 元素加載出,傳入定位元組, (By.ID,'p')
visibility_of_element_located  元素可見,傳入定位元組
visibility_of 可見,傳入元素對象
presence_of_all_elements_located  全部元素加載出
text_to_be_present_in_element   某個元素文本包含某個字
text_to_be_present_in_element_value 某個元素值包含某個字
frame_to_be_available_and_switch_to_it  ifram加載並切換
invisibility_of_element_located  元素不可見
element_to_be_clickable 元素可點擊
staleness_of  判斷一個元素是否仍在DOM,可判斷頁面是否已經刷新
element_to_be_selected  元素可選擇,傳入定位元組
element_located_to_be_selected 元素可選擇,傳入定位元組
element_selection_state_to_be 傳入元素對象以及狀態, 相等返回True,不然返回False
element_located_selection_state_to_be 傳入定位元組以及狀態,相等返回True,不然返回False
alert_is_present 是否出現Alert
'''
# 遊覽器前進後退
'''
import time
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.baidu.com')
browser.get('https://www.taobao.com')
browser.get('https://www.python.org')
browser.back()  # 後退
time.sleep(1)
browser.forward()  # 前進
browser.close()
'''
# cookie 獲取和設置
'''
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.zhihu.com/explore')
# 獲取
print(browser.get_cookies())
# 添加
browser.add_cookie({'name': 'name','domain':'www.zhihu.com','value':'germey'})
print(browser.get_cookies())
# 刪除
browser.delete_all_cookies()
print(browser.get_cookies())
'''
# 選項卡(打開多個頁面)
'''
import time
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.baidu.com')
browser.execute_script('window.open()')
print(browser.window_handles)  # 當前有幾個遊覽器窗口
browser.switch_to_window(browser.window_handles[1])  # 切換第二個
browser.get('https://www.taobao.com')
time.sleep(1)
browser.switch_to_window(browser.window_handles[0])  # 切換第一個
browser.get('https://python.org')
'''
# 異常處理
'''
id不存在異常
from selenium import webdriver
from selenium.common.exceptions import TimeoutException, NoSuchElementException
browser = webdriver.Chrome()
try:
    browser.get('https://www.baidu.com')
except TimeoutException:
    print('Time out')
try:
    browser.find_element_by_id('hello')
except NoSuchElementException:
    print("No Element")
finally:
    browser.close()
'''
from multiprocessing import Pool