擅长:python、mysql、java
<p>使用<code>collections.defaultdict</code>:</p>
<pre><code>from collections import defaultdict
import csv
d = defaultdict(list)
with open(filename, 'r', newline='') as f:
reader = csv.reader(f, delimiter='\t')
next(reader) # toss headers
for ticket, asset in reader:
d[ticket].append(asset)
</code></pre>
<p>使用常规词典:</p>
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