title: List comprehensions Conversion
body: <p>i started learning Python recently and i am facing difficulty converting the below piece of code into a list comprehension:</p>
  
  <pre><code>    list = []     #An empty List
      for key,value in defaultDict.items():#iterate through the default dict
          for i in defaultDict[key]:#iterate through the list in the defaultDict
              if i not in list:#If the item in the list is not present in the main list
                  list.append(i)#append it
  </code></pre>
  
  <p>Is it possible for me to even do it??Any help with this is much appreciated.</p>