markdown-it demo

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```py
from bs4 import BeautifulSoup

html = """
<html>
<head>
    <title>Example</title>
</head>
<body>
    <h1>Example</h1>
    <p>Paragraph 1</p>
    <p>Paragraph 2</p>
    <ul>
        <li>Item 1</li>
        <li>Item 2</li>
    </ul>
</body>
</html>
"""

# 創建 BeautifulSoup 對象
soup = BeautifulSoup(html, 'html.parser')

# 獲取 title 元素的內容
title = soup.title.string
print(title)  # "Example"

# 獲取所有 p 元素的內容
ps = soup.find_all('p')
for p in ps:
    print(p.string)

# 獲取第一個 li 元素的內容
li = soup.find('li')
print(li.string)
```

```py
from bs4 import BeautifulSoup

soup = BeautifulSoup(html, 'html.parser')

# 獲取第一個 p 元素對象
p1 = soup.find('p')

# 獲取第二個 p 元素對象
p2 = p1.find_next('p')

print(p1.string)  # "Paragraph 1"
print(p2.string)  # "Paragraph 2"
```
```py
from bs4 import BeautifulSoup

# 範例 HTML
html = """
<div class="item checked">Item 1</div>
<div class="item">Item 2</div>
<div class="item checked">Item 3</div>
"""

# 將 HTML 轉為 BeautifulSoup 物件
soup = BeautifulSoup(html, 'html.parser')

# 找到 class 屬性值包含 checked 的 div 標籤
div_list = soup.find_all('div', {'class': lambda x: x and 'checked' in x})

# 列印結果
for div in div_list:
    print(div.text)
```

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