title: Splitting Dataframe into two DataFrame
body: <p>I have a dateframe which have unique as well as repeated records on the basis of number. Now i want to split the dataframe into two dataframe. In first dataframe i need to copy only unique rows and in second dataframe i want all repeated rows. For example</p>
  
  <pre><code>     id   name     number
       1    Shan     101
       2    Shan     101
       3    John     102
       4    Michel   103
  </code></pre>
  
  <p>The two splitted dataframe should be like</p>
  
  <p>Unique</p>
  
  <pre><code>      id    name    number
        3     John    102
        4     Michel  103
  </code></pre>
  
  <p>Repeated</p>
  
  <pre><code>      id   name     number
        1    Shan     101
        2    Shan     101
  </code></pre>