title: Retain all entries except for one key python
body: <p>I have a python dictionary. Just to give out context, I am trying to write my own simple cross validation unit.</p>
  
  <p>So basically what I want is to get all the values except for the given keys.
  And depending on the input, it returns all the values from a dictionary except to those what has been given.</p>
  
  <p>So if the input is 2 and 5 then the output values doesn't have the values from the keys 2 and 5?</p>