title: Remove unwanted parts from strings in a column
body: <p>I am looking for an efficient way to remove unwanted parts from strings in a DataFrame column.</p>
  
  <p>Data looks like:</p>
  
  <pre><code>    time    result
  1    09:00   +52A
  2    10:00   +62B
  3    11:00   +44a
  4    12:00   +30b
  5    13:00   -110a
  </code></pre>
  
  <p>I need to trim these data to:</p>
  
  <pre><code>    time    result
  1    09:00   52
  2    10:00   62
  3    11:00   44
  4    12:00   30
  5    13:00   110
  </code></pre>
  
  <p>I tried <code>.str.lstrip('+-')</code> and .<code>str.rstrip('aAbBcC')</code>, but got an error:  </p>
  
  <pre><code>TypeError: wrapper() takes exactly 1 argument (2 given)
  </code></pre>
  
  <p>Any pointers would be greatly appreciated!</p>