title: How to make float value positive in Pandas?
body: <p>I have DataFrame, and I need to update the value in column 'difference' from minus value to plus value, if the value in column '3_min' == 0.0
  I try to do the next action, but I don't know what argument I need to paste to the function abs.</p>
  <pre><code>df.loc[df['3_min'] == 0.0, 'difference'] = abs() # ????
  </code></pre>
  <p>Below is a screenshot of part a DataFrame, and allotted the values which I require to change
  (for example, from -772.00 to 772.00 and from -213.00 to 213.00). I would be grateful for your help.</p>
  <p><a href="https://i.stack.imgur.com/w3rVL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/w3rVL.png" alt="enter image description here" /></a></p>