title: No module named xlsxwriter error while writing pandas df to excel
body: <p>While writing the pandas code that writes <em>dataframe</em> to Excel. </p>
  
  <pre><code>import pandas as pd
  
  df = pd.DataFrame({'Data': [10, 20, 30, 20, 15, 30, 45]})
  writer = pd.ExcelWriter('pandas_simple.xlsx', engine='xlsxwriter')
  df.to_excel(writer, sheet_name='Sheet1')
  writer.save()
  </code></pre>
  
  <p>I am getting this error:</p>
  
  <pre><code>File "/usr/local/lib64/python2.7/site-packages/pandas/io/excel.py", line 1934, in __init__
  import xlsxwriter
  ImportError: No module named xlsxwriter
  </code></pre>
  
  <p>Do I need to import <strong>xlsxwriter</strong> module explicitly in the python file?</p>