擅长:python、mysql、java
<p>将<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.str.split.html" rel="noreferrer">^{<cd1>}</a>与<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.stack.html" rel="noreferrer">^{<cd2>}</a>一起用于<code>Series</code>:</p>
<pre><code>a = df['column_name'].str.split('|', expand=True).stack().value_counts()
print (a)
book 3
fish 2
icecream 1
campfire 1
dtype: int64
</code></pre>
<p>或者<code>Counter</code>使用列表理解和扁平化:</p>
^{pr2}$