title: AttributeError: 'numpy.float64' object attribute 'fill' is read-only
body: <p>how do I rectify this? I am trying to add color to a excel cell using python</p>
  <pre><code>import openpyxl
  from openpyxl.styles import PatternFill
  fill_cell = PatternFill(patternType='solid', 
                          fgColor='C64747')
  df['2'][i+1].fill=fill_cell
  </code></pre>