frames.py

from selenium.webdriver.chrome.service import Service
from selenium import webdriver
from selenium.webdriver.common.by import By
from webdriver_manager.chrome import ChromeDriverManager

#init driver
driver_path = ChromeDriverManager().install()
service = Service(driver_path)
driver = webdriver.Chrome(service=service)

driver.implicitly_wait(4)

#open url
driver.get("https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_iframe")

#switch to frame 1
driver.switch_to.frame("iframeResult")

#switch to frame 2
frame2 = driver.find_element(By.CSS_SELECTOR, "iframe[src='https://www.w3schools.com']")
driver.switch_to.frame(frame2)

menu = driver.find_element(By.CSS_SELECTOR, '.tnb-menu-btn')
print(menu.get_attribute('title'))

assert menu.get_attribute('title') == 'Menu', f"Title is {menu.get_attribute('title')} instead of Menu"

driver.quit()