title: Pandas cannot write to excel
body: <p>I am trying to write a dataframe to excel:</p>
  
  <pre><code>writer = pd.ExcelWriter("C:/PortfolioStats.xlsx")
  df.to_excel(writer, 'Data',index=False)
  writer.save()
  </code></pre>
  
  <p>I keep getting error:</p>
  
  <pre><code>'ascii' codec can't decode byte 0xe5 in position 20: ordinal not in range(128)
  </code></pre>
  
  <p>It was working fine but suddenly stopped working. How do I know which data point is giving error?</p>