title: Split a column value based on condition
body: <p>I am trying to split a column based on whether a slash('/) is present in the cell within that column. Not all cells contain slashes. Most only contain 3 letters (e.g.'ABC').</p>
  <p>I am trying to avoid for loops since they affect performance. I have tried the following code:</p>
  <pre><code>df.column.split('/',expand=True)
  </code></pre>
  <p>I get the following outut:</p>
  <pre><code>AttributeError: 'Series' object has no attribute 'split'
  </code></pre>