擅长:python、mysql、java
<p>IIUC只需转换为datetime并使用<code>dt.strftime</code></p>
<pre><code>df['month'] = pd.to_datetime(df['month'],format='%d%Y').dt.strftime('%d/%Y')
</code></pre>
<hr/>
<pre><code>output:
print(df)
month
0 01/2019
1 15/2019
2 22/2019
3 14/2019
4 30/2019
5 01/2020
</code></pre>
<p>如果您还想添加一个月,只需将其添加到字符串中即可</p>
<pre><code>month = '01'
df['month'] = pd.to_datetime(df['month'].astype(str) +
month,format='%d%Y%m').dt.strftime('%m/%d/%Y')
</code></pre>
<hr/>
<pre><code>print(df)
month
0 01/01/2019
1 01/15/2019
2 01/22/2019
3 01/14/2019
4 01/30/2019
5 01/01/2020
</code></pre>