Python Pandas - 将子列从一列复制到另一列

Question

我有以下数据帧

<style type="text/css">
.tg  {border-collapse:collapse;border-spacing:0;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;}
.tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;}
.tg .tg-baqh{text-align:center;vertical-align:top}
.tg .tg-9hbo{font-weight:bold;vertical-align:top}
.tg .tg-yw4l{vertical-align:top}
</style>
<table class="tg">
  <tr>
    <th class="tg-9hbo">JobID</th>
    <th class="tg-9hbo">JobName</th>
    <th class="tg-9hbo">JobLink</th>
  </tr>
  <tr>
    <td class="tg-baqh">n/a</td>
    <td class="tg-baqh">Some job name</td>
    <td class="tg-yw4l">https://www.particulawebsite.com/jobs-some-job-name.id123465789</td>
  </tr>
  <tr>
    <td class="tg-baqh">n/a</td>
    <td class="tg-baqh">another job name</td>
    <td class="tg-yw4l">https://www.particulawebsite.com/jobs-another-job-name.id987654321</td>
  </tr>
  <tr>
    <td class="tg-baqh">n/a</td>
    <td class="tg-baqh">yet another name</td>
    <td class="tg-yw4l">https://www.particulawebsite.com/jobs-yet-another-job-name.id987321654</td>
  </tr>
</table>

我想要做的是从JobLink列复制id部分并将其放在JobID列中。到目前为止还没有成功地做到这一点，因此我的问题。

非常感谢，D

Answer 1

希望这可以帮助！

df['JobID'] = df['JobLink'].map(lambda x: x.split('.')[-1])

这会将'JobID'的第一行存储为'id123465789'

Answer 2

这样的事怎么样？

df.JobID = df.JobLink.str.extract(r'\.id(.+)$')

输出：

0      JobID           JobName                                            JobLink
1  123465789     Some job name  https://www.particulawebsite.com/jobs-some-job...
2  987654321  another job name  https://www.particulawebsite.com/jobs-another-...
3  987321654  yet another name  https://www.particulawebsite.com/jobs-yet-anot...