title: sort series with pandas in python
body: <p>I selected one column from the a DataFrame, then I got a Series. How can I sort the series? I used the Series.sort(), but it doesn't work. </p>
  
  <pre><code>df = pd.DataFrame({'A': [5,0,3,8],
                      'B': ['B8', 'B9', 'B10', 'B11']})
  df
  
      A   B
  0   5   B8
  1   0   B9
  2   3   B10
  3   8   B11
  </code></pre>
  
  <p>Then I selected the column 'A'</p>
  
  <pre><code>df['A']
  
      A
   0  5
   1  0
   2  3
   3  8
  </code></pre>
  
  <p>After selected 'A' column, I got a Series, but with Series.sort(), it doesn't work.</p>
  
  <pre><code>df['A'].sort()
  </code></pre>
  
  <p>It shows the error:</p>
  
  <p>"ValueError: This Series is a view of some other array, to sort in-place you must create a copy"</p>
  
  <p>So I used the Series.copy() function to copy the series, after that I sort the series, but there is no outcome.</p>
  
  <pre><code>df['A'].copy().sort()
  </code></pre>
  
  <p>But there is no result returned.</p>
  
  <p>How can I fix the problem?</p>