title: create a dataframe with dataframes of different sizes
body: <p>I have a dataframe and two array with differents sizes and i want to create a single dataframe</p>
  
  <p>for example </p>
  
  <pre><code>import pandas
  import numpy
  
   df = pandas.DataFrame(numpy.array([[0,0,1]]),columns = ['A', 'B', 'C'])
    V1=numpy.array([0,1,3,4])
    V2=numpy.array([2,3,5,8,11,12])
  </code></pre>
  
  <p>I want obtain a single dataframe like :</p>
  
  <pre><code>  A  B  C V1 V2
    0  0  1 0   2
    0  0  1 1   3
    0  0  1 3   5
    0  0  1 4   8   
    0  0  1 Nan 11
    0  0  1 Nan 12
  </code></pre>