title: Combine two series as new one in dataframe?
body: <pre><code>type(x)
  &lt;class 'pandas.core.frame.DataFrame'&gt;
  x.shape
  (18, 12)
  </code></pre>
  
  <p>To reference the first row and 3:5 columns with expression:</p>
  
  <pre><code>type(x.iloc[0,3:5])
  &lt;class 'pandas.core.series.Series'&gt;
  x.iloc[0,3:5]
  total_operating_revenue            NaN
  net_profit                 3.43019e+07
  Name: 2001-12-31, dtype: object
  </code></pre>
  
  <p>To reference the first row and 8:10 columns with expression:</p>
  
  <pre><code>type(x.iloc[0,8:10])
  &lt;class 'pandas.core.series.Series'&gt;
  x.iloc[0,8:10]
  total_operating_revenue_parent    5.05e+8
  net_profit_parent                 4.4e+07
  Name: 2001-12-31, dtype: object
  </code></pre>
  
  <p>I want to get the combined new series (suppose it <code>y</code>)as following:</p>
  
  <pre><code>type(y)
  &lt;class 'pandas.core.series.Series'&gt;
  y.shape
  (4,)
  </code></pre>
  
  <p><code>y</code> contains:</p>
  
  <pre><code>total_operating_revenue            NaN
  net_profit                 3.43019e+07
  total_operating_revenue_parent    5.05e+8
  net_profit_parent                 4.4e+07
  Name: 2001-12-31, dtype: object
  </code></pre>
  
  <p>My failed tries:</p>
  
  <pre><code>x.iloc[0,[3:5,8:10]]
  x.iloc[0,3:5].combine(x.iloc[0,8:10])  
  </code></pre>
  
  <p><code>pd.concat([x.iloc[0,3:5],x.iloc[0,8:10]],axis=1)</code> is not my expect,totally differ from <code>y</code>.</p>
  
  <pre><code>z = pd.concat([x.iloc[0,3:5],x.iloc[0,8:10]],axis=1)
  type(z)
  &lt;class 'pandas.core.frame.DataFrame'&gt;
  z.shape
  (4, 2)  
  </code></pre>