download：Flutter从入门到进阶 实战携程网App
本课程将带你从入门到进阶，全面掌握Flutter开发核心技术。通过本课程的学习，可以让你的Fluter技术能力和项目经验都得到前所未有的提升！课程具体收获【可直接看章节描述】：Flutter入门，AI语音，网络编程，数据存储，异步编程，自定义组件， 原生模块封装调用 ，Flutter混合开发，Flutter升级适配指南，项目案例实战等。
适合人群
Android、iOS或前后端开发工程师
对Flutter技术感兴趣的开发工程师
技术储备要求
具备Dart语言基础；
了解AndroidStudio ，Xcode开发工具
import time
from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
# 启动Chromedriver，并与Chromedriver开启会话
driver = webdriver.Chrome()
driver.maximize_window()
driver.get("http://www.baidu.com")
# 第一步：实例化ActionChains
ac = ActionChains(driver)
# 第二步：定位要操作的元素
ele = driver.find_element_by_xpath('//span[@id="s-usersetting-top"]')
# 第三步：执行对应的操作
ac.move_to_element(ele) # 悬浮操作
# 第四步，释放鼠标动作
ac.perform()
# 点击悬停出来的页面上的元素
wait = WebDriverWait(driver, 10)
loc = (By.XPATH, '//a[@class="setpref"]')
wait.until(EC.visibility_of_element_located(loc))
driver.find_element(*loc).click()
time.sleep(2)
driver.quit()def move_to():
print("正在挪动")
def click():
print('点击')
actions = []
actions.append(move_to)
actions.append(click)
for action in actions: # perform
# action = move_to
action()import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
# 启动Chromedriver，并与Chromedriver开启会话
driver = webdriver.Chrome()
driver.maximize_window()
driver.get("http://www.baidu.com")
driver.find_element_by_id('kw').send_keys("selenium") # 没有点击百度一下也没有回车不会呈现搜索结果
time.sleep(2)
driver.find_element_by_id('kw').send_keys(Keys.CONTROL,'a') # 全选然后输入新内容python
driver.find_element_by_id('kw').send_keys('python', Keys.ENTER) # 用回车替代点击搜索按钮
time.sleep(2)
# driver.find_element_by_id('kw').send_keys('python') # 也能够单独先输内容
# driver.find_element_by_id('kw').send_keys(Keys.ENTER) # 再回车
time.sleep(2)
driver.quit()<html>
<head>
<meta charset="UTF-8">
<title>下拉框演示</title>
</head>
<body>
<select id="province">
<option value="sj">深圳</option>
<option value="gd">广东</option>
<option value="sh">上海</option>
<option value="bj">北京</option>
</select>
<select id="city">
<option value="sj">深圳</option>
<option value="gz">广州</option>
<option value="sh">上海</option>
<option value="bj">北京</option>
</select>
</body>
</html> 演示代码如下：import time
from selenium import webdriver
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support.ui import Select
# 启动Chromedriver，并与Chromedriver开启会话
driver = webdriver.Chrome()
driver.maximize_window()
driver.get(r"D:\learn\test.html")
wait = WebDriverWait(driver, 10)
# 找到select元素
ele = driver.find_element_by_id('province')
# 实例化Select类
s = Select(ele)
time.sleep(1)
s.select_by_value('gd') # 经过value属性选值
time.sleep(2)
s.select_by_index(2) # 经过下标index选值
time.sleep(2)
s.select_by_visible_text('北京') # 经过文本内容选值
time.sleep(2)
driver.quit()import time
import datetime
from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
# 启动Chromedriver，并与Chromedriver开启会话
driver = webdriver.Chrome()
# driver.maximize_window()
driver.get("https://www.12306.cn/")
wait = WebDriverWait(driver, 30)
loc = (By.XPATH, '//input[@id="train_date"]')
wait.until(EC.visibility_of_element_located(loc))
js = 'document.getElementById("train_date").readOnly=false;'
driver.execute_script(js)
time.sleep(2)
# 清空日历，重新输入日期
driver.find_element(*loc).clear()
today = datetime.date.today()
tomorrow = today + datetime.timedelta(days=1)
driver.find_element_by_id('train_date').send_keys(str(tomorrow))
time.sleep(2)
driver.quit()
