title: python: changing row index of pandas data frame
body: <p>I have a data frame called <code>followers_df</code> as below:</p>
  
  <pre><code> followers_df
  
               0
  0         oasikhia 
  0     LEANEnergyUS
  0  _johannesngwako
  0     jamesbreenre
  0   CaitlinFecteau
  0  mantequillaFACE
  0         apowersb
  0       ecoprinter
  0        tsdesigns
  0      GreenBizDoc
  0        JimHarris
  0    Jmarti11Julia
  0         JAslat63
  0            prAna
  0    GrantLundberg 
  0        Jitasa_Is
  0     ChoosePAWind
  0  cleanpowerperks
  0          WoWEorg
  0      Laura_Chuck
  </code></pre>
  
  <p>I want to change this data frame into something like this:</p>
  
  <pre><code> followers_df
  
               0
  0          oasikhia 
  1      LEANEnergyUS
  2   _johannesngwako
  3      jamesbreenre
  4    CaitlinFecteau
  5   mantequillaFACE
  6          apowersb
  7        ecoprinter
  8         tsdesigns
  9       GreenBizDoc
  10        JimHarris
  11    Jmarti11Julia
  12         JAslat63
  13            prAna
  14    GrantLundberg 
  15        Jitasa_Is
  16     ChoosePAWind
  17  cleanpowerperks
  18          WoWEorg
  19      Laura_Chuck
  </code></pre>
  
  <p>how can I do this? I tried:</p>
  
  <pre><code>     index = pandas.Index(range(20))
       followers_df = pandas.DataFrame(followers_df, index=index)
  </code></pre>
  
  <p>but it's giving me the following error:</p>
  
  <pre><code>  ValueError: Shape of passed values is (1, 39), indices imply (1, 20)
  </code></pre>
  
  <p>thanks,</p>