title: How to access chart.series values with pptx if series includes string-values?
body: <p>I want to open the data of a chart in power point using the pptx package in python. If the chart-data has floating-values only, then I can access the values as follows</p>
  <pre><code>from pptx import Presentation
  
  prs = Presentation('my_presentation.pptx')
  chart = prs.slides[0].shapes[7].chart # this is the chart of interest in my_presentation.pptx
  time_series = chart.series[0].values
  </code></pre>
  <p>The problem: The chart-data also includes a string-value ('#N/A'). Any ideas how to get both the float and string values of <code>chart.series[0]</code>?</p>