當嘗試從 instagram 抓取網頁時，代碼會從帖子 url 中提取影像，即使它是視頻。我對為什么它需要一個隨機的 jpg 而不是 else 陳述句中的 mp4 感到困惑。
time.sleep(5)
posts = []
links = driver.find_elements_by_tag_name('a')
for link in links:
post = link.get_attribute('href')
if '/p/' in post:
posts.append(post)
#get videos and images
download_url = ''
for post in posts:
driver.get(post)
shortcode = driver.current_url.split("/")[-2]
time.sleep(7)
if driver.find_element_by_css_selector("img[style='object-fit: cover;']") is not None:
download_url = driver.find_element_by_css_selector("img[style='object-fit: cover;']").get_attribute('src')
urllib.request.urlretrieve( download_url, '{}.jpg'.format(shortcode))
else:
download_url = driver.find_element_by_css_selector("video[type='video/mp4']").get_attribute('src')
urllib.request.urlretrieve( download_url, '{}.mp4'.format(shortcode))
time.sleep(5)
uj5u.com熱心網友回復：
我想我們可以改用“Try-Except”塊：
try:
download_url = driver.find_element(By.CSS_SELECTOR, "img[style='object-fit: cover;']").get_attribute('src')
print(download_url)
urlretrieve(download_url, '{}.jpg'.format(shortcode))
except:
download_url = driver.find_element(By.CSS_SELECTOR, "video[type='video/mp4']").get_attribute('src')
print(download_url)
urlretrieve(download_url, '{}.mp4'.format(shortcode))
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