擅长:python、mysql、java
<p>不需要遍历字典键-快速查找是使用字典而不是元组或列表的主要原因之一。你知道吗</p>
<p>用try/except:</p>
<pre><code>def getSongTime(songDictionary):
requestedSong=input("Enter song from playlist: ")
try:
print(requestedSong, songDictionary[requestedSong])
except KeyError:
print("Not found")
</code></pre>
<p>使用dict的<code>get</code>方法:</p>
<pre><code>def getSongTime(songDictionary):
requestedSong=input("Enter song from playlist: ")
print(requestedSong, songDictionary.get(requestedSong, "Not found"))
</code></pre>