title: How to replace columns with matching name
body: <p>I know this might be very simple, but I can't figure out how to do it.</p>
  
  <p>I have a df with several columns I want to replace, but lets say I have a df like this:</p>
  
  <pre><code>df1:
  
     A   B
  0  a   22
  1  b   44 
  2  c   100
  3  d   6
  4  e   12
  </code></pre>
  
  <p>And another df</p>
  
  <pre><code>df2:
  
     B
  0  11
  1  22 
  2  50
  3  3
  4  6
  </code></pre>
  
  <p>My desired df is</p>
  
  <pre><code>df1:
  
     A   B
  0  a   11
  1  b   22 
  2  c   50
  3  d   3
  4  e   6
  </code></pre>
  
  <p>Also, I don't want to do it one by one, because I have several columns.</p>