擅长:python、mysql、java
<p>你可以试试:</p>
<pre><code># find number of unique users
nunique = df.user.nunique()
# find number of unique users by destination
destinations = df.groupby('destination').user.nunique().to_frame().reset_index()
# find the destinations that match
result = destinations[destinations.user == nunique].drop('user', axis=1)
print(result)
</code></pre>
<p><strong>输出</strong></p>
<pre><code> destination
0 dest1
3 dest4
</code></pre>