title: how to find value inside pandas columns
body: <p>I have a pandas column :'function' ,of jobs functions:
  IT,HR etc..
  but I have them in few variations for each function.
  ('IT application','IT,Digital,Digital' etc..)
  I wanted to change all values that contains IT -&gt; IT for example.</p>
  <p>I tried:</p>
  <pre><code>df['function'].str.contains('IT')
  df['function'].isin(['IT'])
  </code></pre>
  <p>which gives only partial results.</p>
  <p>I wanted something like:
  'IT' in df.loc[:,'function']</p>
  <p>but a solution that would work for all the column and not for 1 index at a time.
  if there is a solution that doesn't need a loop that would be great.</p>