我有一个包含列表列的数据框：
col_1
[A, A, A, B, C]
[D, B, C]
[C]
[A, A, A]
NaN
我想创建新列，如果列表以 3* 开头A，则返回 1，否则返回 0：
col_1 new_col
[A, A, A, B, C] 1
[D, B, C] 0
[C] 0
[A, A, A] 1
NaN 0
我试过这个但没有用：
df['new_col'] = df.loc[df.col_1[0:3] == [A, A, A]]
我想从这个网站上抓取头条新闻：https : //www.marketwatch.com/latest-news?mod=top_nav
我需要加载较早的新闻，因此需要单击蓝色按钮“查看更多”。
我创建了这段代码，但没有奏效：
from bs4 import BeautifulSoup
import time
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
u = 'https://www.marketwatch.com/latest-news?mod=top_nav' #US Business
driver = webdriver.Chrome(executable_path=r"C:/chromedriver.exe")
driver.maximize_window()
driver.get(u)
time.sleep(10)
WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CLASS_NAME,'close-btn'))).click()
time.sleep(10)
driver.execute_script("window.scrollTo(0, document.body.scrollHeight)")
for i in range(3):
element =WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR,'component.component--module.more-headlines div.group.group--buttons.cover > a.btn.btn--secondary.js--more-headlines)))
driver.execute_script("arguments[0].scrollIntoView();", element)
element.click()
time.sleep(5)
driver.execute_script("arguments[0].scrollIntoView();", element)
print(f'click {i} done')
soup = BeautifulSoup(driver.page_source, 'html.parser')
driver.quit()
它返回此错误：
raise TimeoutException(message, screen, stacktrace)
selenium.common.exceptions.TimeoutException: Message:
我想从这个页面“https://m.aiscore.com/basketball/20210610”中抓取所有匹配链接，但只能得到限制数量的匹配：我试过这个代码：
import requests
from bs4 import BeautifulSoup
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
options = Options()
options.add_argument("--headless")
driver = webdriver.Chrome(executable_path=r"C:/chromedriver.exe", options=options)
url = 'https://m.aiscore.com/basketball/20210610'
driver.get(url)
driver.maximize_window()
driver.implicitly_wait(60)
driver.execute_script("window.scrollTo(0, document.body.scrollHeight)")
soup = BeautifulSoup(driver.page_source, 'html.parser')
links = [i['href'] for i in soup.select('.w100.flex a')]
links_length = len(links) #always return 16
driver.quit()
当我运行代码时，我总是只得到 16 个匹配链接，但页面有 35 个匹配。我需要获取页面中的所有匹配链接。