Python爬蟲: Selenium 的 expected_conditions 與 例外狀況; from selenium.webdriver.support import expected_conditions as EC ; from selenium.common.exceptions import NoSuchElementException, TimeoutException

from webdriver_manager.chrome import ChromeDriverManager
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service
import os
import json
from typing import List,Tuple
import time
from selenium.webdriver import ActionChains
from selenium.common.exceptions import NoSuchElementException, TimeoutException


locator下載=(By.CSS_SELECTOR, 'button[title="下載"]')
#:Tuple[str,str]
while True:
    try:
        # download_buttons = WebDriverWait(driver, 10).until(
        #     EC.presence_of_all_elements_located(locator下載)
      
        download_buttons = WebDriverWait(driver, 10).until(
            EC.visibility_of_all_elements_located(locator下載)
        #如果沒有先定義好 locator下載:Tuple[str,str]
        #EC.visibility_of_all_elements_located()
        #會需要(());外層是屬於function;內層是屬於tuple
        for btn in download_buttons:
            btn.click()
            time.sleep(0.5)  # 給予頁面一定的響應時間

        # 檢查“下一頁”按鈕是否可點擊
        # next_page_button = WebDriverWait(driver, 10).until(
        #     EC.element_to_be_clickable((By.CSS_SELECTOR, 'button.btn-next:not([disabled])'))
        # )
        #最後一頁的時候,
        #WebDriverWait 等待條件 
        #element_to_be_clickable 不會滿足，
        #因為按鈕有 disabled 屬性（不可點擊）。
        #Selenium 會在等待 10 秒後拋出 TimeoutException，
        #並進入 except TimeoutException 部分。

        # 檢查"下一頁"按鈕是否存在
        next_page_button = WebDriverWait(driver, 10).until(
            EC.presence_of_element_located((By.CSS_SELECTOR, 'button.btn-next'))
        )

        if next_page_button.get_attribute("disabled"): # == "true"
            print("已经是最後一页")
            break
        next_page_button.click()
"""
        # 等待頁面刷新或加載新的內容
        WebDriverWait(driver, 10).until(
            EC.visibility_of_any_elements_located(locator下載)
        )
#while迴圈最一開始已經有
download_buttons = WebDriverWait(driver, 10).until(
            EC.visibility_of_all_elements_located((By.CSS_SELECTOR, 'button[title="下載"]'))
#不用多檢查一次下載按鈕是否可見
"""      
    except TimeoutException as e:
        print(f"等待超時，可能已經是最後一頁或頁面未正確加載\n{e}")
        break

    except NoSuchElementException as e:
        print(f"元素未找到，可能已經是最後一頁\n{e}")
        break