擅长:python、mysql、java
<p>为此,使用<code>str.translate</code>是合适的。像这样:</p>
<pre class="lang-py prettyprint-override"><code>#!python2
import string
trans = string.maketrans("ACTG", "TGAC")
user = raw_input()
print user.translate(trans)
</code></pre>
<pre><code>#!python3
trans = str.maketrans('ACTG', 'TGAC')
user = input()
print(user.translate(trans))
</code></pre>