擅长:python、mysql、java
<p>Mayank提供了一个很好的答案,您仍然可以探索pandas<code>apply</code>方法</p>
<pre><code>df_activity_filter['activity_preferance'] = df['activityType'].apply(lambda x: 1 if x=='joinClub' else None)
df_activity_filter['activity_preferance'] = df['activityType'].apply(lambda x: 2 if x=='post' else None)
and similarly others...
</code></pre>