How does one define , extract and replace data from a Chart in an existing Powerpoint using Python

问题

Currently I am using the following code to define and replace Placeholder (Text data) in existing Powerpoint presentations.

current_dir = os.path.dirname(os.path.realpath(__file__))

prs = Presentation(current_dir + '/test2.pptx')

slides = prs.slides

title_slide_layout = prs.slide_layouts[0]
slide = slides[0]
for shape in slide.placeholders:
    print('%d %s' % (shape.placeholder_format.idx, shape.name))
title = slide.shapes.title
subtitle1 = slide.shapes.placeholders[0]
subtitle2 = slide.shapes.placeholders[10]
subtitle10 = slide.shapes.placeholders[11]
subtitle11 = slide.shapes.placeholders[12]

subtitle1.text = "1"
subtitle2.text = "2"
subtitle10.text = "3"
subtitle11.text = "4"


slide2 = slides[1]
for shape in slide2.placeholders:
    print('%d %s' % (shape.placeholder_format.idx, shape.name))
subtitle3 = slide2.shapes.placeholders[10]
subtitle4 = slide2.shapes.placeholders[11]
subtitle5 = slide2.shapes.placeholders[12]
subtitle6 = slide2.shapes.placeholders[13]
subtitle12 = slide2.shapes.placeholders[16]
companydate = slide2.shapes.placeholders[14]

subtitle3.text = "1"
subtitle4.text = "2"
subtitle5.text = "3"
subtitle6.text = "4"
subtitle12.text = "40%"
companydate.text = "Insert company"

slide3 = slides[2]
for shape in slide3.placeholders:
     print('%d %s' % (shape.placeholder_format.idx, shape.name))
subtitle7 = slide3.shapes.placeholders[10]
subtitle8 = slide3.shapes.placeholders[11]
subtitle9 = slide3.shapes.placeholders[12]
subtitle13 = slide3.shapes.placeholders[16]
companydate2 = slide3.shapes.placeholders[14]

subtitle7.text = "1"
subtitle8.text = "2"
subtitle9.text = "3"
subtitle13.text = "5x"
companydate2.text = "Insert Company"

slide4 = slides[3]
# for shape in slide4.placeholders:
#print('%d %s' % (shape.placeholder_format.idx, shape.name))
companydate3 = slide4.shapes.placeholders[14]
companydate3.text = "Insert Company"

"'Adapting Charts'"
from pptx.chart.data import ChartData
from pptx.enum.chart import XL_CHART_TYPE
from pptx.util import Pt

"Adapting Chart 1"

prs1 = Presentation(current_dir + '/output4.pptx')
slides1 = prs1.slides

chart1 = prs1.slides[0].chart

However, I am also running analytics in the background and I was wondering if it is possible to recognize (define) charts in the same presentation along with extracting and replacing the data in those charts. These chards are not embedded in the template. As plotting charts with plotly or mathplotlib does not render a compliant image I am not able to use these , unless fully modified into the following format:Graph budget Click Correl If yes, would it be possible to give concrete coding examples?

Thanks in advance!

回答1:

Yes, it's possible to do that. The documentation will be your best source.

This will find the chart shapes:

for shape in slide.shapes:
    if shape.has_chart:
        chart = shape.chart
        print('found a chart')

Data is extracted from the chart series(es):

for series in chart.series:
    for value in series.values:
        print(value)

Data is replaced by creating a new ChartData object and calling .replace_data() on the chart using that chart data object:

chart_data = ChartData(...)
...  # add categories, series with values, etc.
chart.replace_data(chart_data)

http://python-pptx.readthedocs.io/en/latest/api/chart.html#pptx.chart.chart.Chart.replace_data

来源：https://stackoverflow.com/questions/44673401/how-does-one-define-extract-and-replace-data-from-a-chart-in-an-existing-power

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python

powerpoint

python-pptx