title: Get all values from each key
body: <p>I just learned that:</p>
  
  <pre><code>coloring_dictionary = {}
  coloring_dictionary.setdefault(key, [])
  coloring_dictionary[key].append(1)
  coloring_dictionary[key].append(77)
  coloring_dictionary[key].append(3)
  </code></pre>
  
  <p>Would give me a dictionary with one key, that maps to three values(I need this in my project!). Great. Now I want to access and do some operations on each value for each key(in this case only one key, but this applies to several keys too.)</p>
  
  <p>How should I write my for loop in order to get each value, one by one?
  This is what I have so far:</p>
  
  <pre><code>for key in coloring_dictionary.keys():
      for the_value in coloring_dictionary[key]:
          print(coloring_dictionary[]????)  #here I want to access A value  
          #do some operations on a value 
  </code></pre>
  
  <p>Might be a simple answer to this, but I am stuck. Thanks in advance my fellow SO community!</p>