<p>在<code>python 2.7</code>中,使用<a href="https://docs.python.org/2/library/urllib.html#urllib.quote" rel="noreferrer">urllib.unquote</a>:</p>
<pre><code>>>> import urllib
>>> urllib.unquote(urllib.unquote('https://url/login_data.php?username=user&categoryid=0&URL=https%3A%2F%2Furl%2F%26TIME%3DFri%2520Aug%252005%25202016%252011%3A40%3A14%2520GMT%2B0530%28India%2520Standard%2520Time%29'))
'https://url/login_data.php?username=user&categoryid=0&URL=https://url/&TIME=Fri Aug 05 2016 11:40:14 GMT+0530(India Standard Time)'
</code></pre>
<p>在<code>python 3+</code>中,使用<a href="https://docs.python.org/3.2/library/urllib.parse.html#urllib.parse.unquote" rel="noreferrer">urllib.parse.unquote</a></p>
<pre><code>>>> from urllib.parse import unquote
>>> unquote(unquote("https://url/login_data.php?username=user&categoryid=0&URL=https%3A%2F%2Furl%2F%26TIME%3DFri%2520Aug%252005%25202016%252011%3A40%3A14%2520GMT%2B0530%28India%2520Standard%2520Time%29"))
'https://url/login_data.php?username=user&categoryid=0&URL=https://url/&TIME=Fri Aug 05 2016 11:40:14 GMT+0530(India Standard Time)'
</code></pre>