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from bs4 import BeautifulSoup

html = "<h1>Hello, World!</h1> <p>This is a paragraph.</p>"
soup = BeautifulSoup(html, 'html.parser')

for h1_tag in soup.find_all('h1'):
    h1_tag.name = 'h2'

print(soup)

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杩欐牱锛屾垜浠氨鎴愬姛浣跨敤BeautifulSoup鏇挎崲浜嗘爣绛俱€?/p>

鎬庝箞浣跨敤BeautifulSoup鏇挎崲鏍囩