Accessing scatter plot data

[mametz]

Hi, thanks for the great library!

How would I access the X-values of a scatter plot?
I figured out how to access the Y-values and categories in Barcharts, but I did not come along a method on how to access the X-Values in scatter plots.

           for x in shape.chart.plots:
              for y in x.categories:
                data_xy[1].append(y)

            for ser in shape.chart.series:
                for x in ser.values:
                    data_xy[0].append(x)

[scanny]

Something like this might work:

from pptx.chart.series import XySeries  # ---not strictly required
xy_series = chart.series[0]  # ---or however you obtain ref to an XySeries object
assert isinstance(xy_series, XySeries)  # ---not strictly required, just so you know what you've got
xVal = xy_series._element.xVal
for idx in range xVal.ptCount_val):
    print xVal.pt_v(idx)

Compare the code for XySeries.values here and abouts:
https://github.com/scanny/python-pptx/blob/master/pptx/chart/series.py#L172