title: How to change a dataframe a certain way pandas python?
body: <p>I have this</p>
  <pre><code>    Date      |Category_1 |Category_2 |Value|
      __________|___________|___________|______
      24.10.2020|A          |AAA        |5
       _________|___________|___________|______
      24.10.2020|A          |BBB        |0.6
       _________|___________|___________|______
      24.10.2020|B          |BBB        |17
  </code></pre>
  <p>I need to get this</p>
  <pre><code>     Date     |A_AAA      |A_BBB      |B_BBB|
      __________|___________|___________|______
      24.10.2020|5          |0.6        |17
      
   
  </code></pre>
  <p>How to do this in python with a help of pandas?</p>