Python 3.x 使用Beauty soup修改href链接内的值

我可以提取href，但我还想修改href链接中的值。 下面是一个例子：-

Input-

    <a style="color:#85bc20" href="https://example.com?new=[sample]&hash=[hashkey]">
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                                                     </a>

输入-

输出-

  <a style="color:#85bc20" href="https://example.com?new="samplevalue"&hash='123'">
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                                                     </a>

from bs4 import BeautifulSoup

html = '<a style="color:#85bc20" href="https://example.com?new=[sample]&hash=[hashkey]"> Unsubscribe </a>'

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

for a in soup.find_all('a'):
  a['href'] = a['href'].replace("[sample]", "samplevalue").replace('[hashkey]', "123")

<a href="https://example.com?new=samplevalue&hash=123" style="color:#85bc20"> Unsubscribe </a>