擅长:python、mysql、java
<pre><code>df['eventlist'] = df['eventlist'].map(lambda x:[i['t'] for i in x])
df
name eventlist
0 a [1234, 2345, 3456]
1 b [2345, 1345, 1356, 1345, 1359]
2 c [1334, 2345, 3556]
df['t_first'] = df['eventlist'][0]
df['t_last']=df['eventlist'].map(lambda x:x[len(x)-1])
df = df[['name','t_first','t_last']]
df
name t_first t_last
0 a 1234 3456
1 b 2345 1359
2 c 3456 3556
</code></pre>