擅长:python、mysql、java
<p>这很容易用<a href="https://www.tutorialspoint.com/python3/dictionary_get.htm" rel="nofollow noreferrer">dict.get</a>解决:</p>
<pre><code>dictionary = {}
with open('%Filename%') as f:
for line in f:
num, key = line.strip().split()
dictionary[key] = dictionary.get(key, []) + [num]
print(dictionary)
</code></pre>