擅长:python、mysql、java
<p>这可能对您有用:</p>
<pre><code>df_cross = pd.DataFrame(data=np.asarray(df.b) + " " + df.b[:,None], columns=df.b)
df_indicator = df_cross.applymap(lambda x: x.split()[0] in x.split()[1])
df_indicator.sum(axis=0)[lambda x: x>1].index
Out[231]: Index([u'world', u'ness'], dtype='object')
</code></pre>