擅长:python、mysql、java
<p>希望这能帮助。。。在</p>
<pre><code>from collections import Counter
emails = re.findall('.*from=<(.*)>,\ssize', line)# Modify re according to your file pattern OR line pattern. If findall() on each line, each returned list should be combined.
result = Counter(emails)# type is <class 'collections.Counter'>
dict(result)#convert to regular dict
</code></pre>
<p>在关于芬德尔()将返回一个列表。查看<a href="https://stackoverflow.com/questions/2600191/how-can-i-count-the-occurrences-of-a-list-item-in-python">How can I count the occurrences of a list item in Python?</a>,有其他方法可以计算返回列表中的单词数。在</p>
<p>顺便说一下,计数器的有趣功能:</p>
^{pr2}$
<p>因此,如果文件很大,我们可以计算每一行,并通过计数器将它们组合起来。在</p>