擅长:python、mysql、java
<p>这就是<a href="https://docs.python.org/3.6/library/collections.html#collections.Counter" rel="nofollow noreferrer"><strong>^{<cd1>}</strong></a>的用途:</p>
<pre><code>from collections import Counter
cnt = Counter()
with open(DATASET_FILE) as fp:
for line in fp.readlines():
for word in line.split():
cnt[word] += 1
</code></pre>
<p>或者(使用发电机时更短更“漂亮”):</p>
<pre><code>from collections import Counter
with open(DATASET_FILE) as fp:
words = (word for line in fp.readlines() for word in line.split())
cnt = Counter(words)
</code></pre>