I frequently use python-pptx, with current version of 0.6.6....
Now I want to set up a chart with two value axis, one on the left, one on the right, just like this:
In the doc of python-pptx, value_axis is accessed by chart.value_axis, but I have not found any description about how to set two value axis (with its own maximum_scale/minimum_scale/major_unit).
Any clue on that?
Picture with two value axis
Following Scanny's answer, I dig a little bit into the lxml, but I found it do not work(with code attached below, just want to test whether the axPos changed to r will take effect or not). just like this post:
Python PPTX Bar Chart negative values
and I have the same problem, when I set invert_if_negative option, something may happen in the lxml layer, and make the manipulation of lxml values do no effect on ppt?
if 'import':
from pptx import Presentation
from pptx.util import *
from pptx.chart.data import ChartData
from pptx.enum.chart import *
import pandas as pd
if __name__ == '__main__':
prs = Presentation()
slide = prs.slides.add_slide(prs.slide_layouts[6])
df = pd.DataFrame({'Term': ('1Y', '2Y', '3Y', '4Y', '5Y'), 'A': (2.3, 2.6, 2.7, 2.8, 3.0), 'B': (6, 7.1, 7.5, 6.9, 8)})
chart_data = ChartData()
chart_data.categories = df.Term
seriesA = chart_data.add_series('A', df.A)
seriesB = chart_data.add_series('B',df.B)
# seriesA.invert_if_negative = False
# seriesB.invert_if_negative = False
x, y, cx, cy = Inches(0.5), Inches(2), Inches(8.5), Inches(4.5)
chart = slide.shapes.add_chart(XL_CHART_TYPE.LINE, x, y, cx, cy, chart_data).chart
cvaxis = chart.value_axis
axPos = cvaxis._element.find('{http://schemas.openxmlformats.org/drawingml/2006/chart}axPos')
print (axPos.values())
axPos.set('val','r')
print (axPos.values())
prs.save('test123.pptx')
