Selenium系列（六） - 详细解读强制等待、隐式等待、显式等待的区别和源码解读

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
__title__  =
__Time__   = 2020/3/25 17:52
__Author__ = 小菠萝测试笔记
__Blog__   = https://www.cnblogs.com/poloyy/
"""
from time import sleep
from selenium import webdriver

driver = webdriver.Chrome("../resources/chromedriver.exe")
20)

# 访问网址
driver.get("http://www.baidu.com")

# ===强制等待3秒才执行下一步===
sleep(3)

# 找到搜索框
inputElement = driver.find_element_by_id("kw")

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
__title__  =
__Time__   = 2020/3/25 17:52
__Author__ = 小菠萝测试笔记
__Blog__   = https://www.cnblogs.com/poloyy/
"""

from selenium import webdriver

# 加载驱动
driver = webdriver.Chrome("../resources/chromedriver.exe")

# ===隐性等待20s===
driver.implicitly_wait(20)

# 访问网址
driver.get("http://www.baidu.com")

# 找到搜索框
inputElement = driver.find_element_by_id("kw")

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
__title__  =
__Time__   = 2020/3/25 17:52
__Author__ = 小菠萝测试笔记
__Blog__   = https://www.cnblogs.com/poloyy/
"""
from time import sleep

from selenium import webdriver

# 加载驱动
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Chrome("../resources/chromedriver.exe")

# 访问网址
driver.get("http://www.baidu.com")

# ===显式等待===

# 设置元素等待实例，最多等10秒，每0.5秒查看条件是否成立
element = WebDriverWait(driver, 10, 0.5).until(
    # 条件：直到元素加载完成
    EC.presence_of_element_located((By.ID, "kw"))
)

class WebDriverWait(object):
    def __init__(self, driver, timeout, poll_frequency=POLL_FREQUENCY, ignored_exceptions=None):
        """Constructor, takes a WebDriver instance and timeout in seconds.

           :Args:
            - driver - Instance of WebDriver (Ie, Firefox, Chrome or Remote)
            - timeout - Number of seconds before timing out
            - poll_frequency - sleep interval between calls
              By default, it is 0.5 second.
            - ignored_exceptions - iterable structure of exception classes ignored during calls.
              By default, it contains NoSuchElementException only.

WebDriverWait(driver, 10).until(driver.find_element_by_id('kw'))

TypeError: 'xxx' object is not callable

element = WebDriverWait(driver, 10).until(lambda x: x.find_element_by_id("someId")) 
is_disappeared = WebDriverWait(driver, 30, 1, (ElementNotVisibleException)).until_not(lambda x: x.find_element_by_id("someId").is_displayed())

class presence_of_element_located(object):
    """ An expectation for checking that an element is present on the DOM
    of a page. This does not necessarily mean that the element is visible.
    locator - used to find the element
    returns the WebElement once it is located
    """
    def __init__(self, locator):
        self.locator = locator

    def __call__(self, driver):
        return _find_element(driver, self.locator)

class By(object):
    """
    Set of supported locator strategies.
    """

    ID = "id"
    XPATH = "xpath"
    LINK_TEXT = "link text"
    PARTIAL_LINK_TEXT = "partial link text"
    NAME = "name"
    TAG_NAME = "tag name"
    CLASS_NAME = "class name"
    CSS_SELECTOR = "css selector"

class presence_of_all_elements_located(object):

    def __init__(self, locator):
        self.locator = locator

    def __call__(self, driver):
        return _find_elements(driver, self.locator)