The World of Python Programming

Mastering python-pptx: Create and Automate PowerPoint Presentations with Python

Image & Multimedia Processing
目次

1. What is python-pptx?

python-pptx is a library that allows you to create, edit, and save PowerPoint presentations directly from Python programs. This eliminates the need for manual work and enables automated generation of dynamic presentation materials based on data, as well as streamlining repetitive tasks.

1.1 Main Uses of python-pptx

  • Automated Presentation Creation: Automatically generate slides for meetings and reports based on data.
  • Efficient Editing: Add slides or text to existing PowerPoint files and update presentation content quickly.

1.2 Advantages of Using Python for PowerPoint

Compared to manual work in PowerPoint, using python-pptx allows for automation through programming. This makes it possible to generate a large number of slides at once or streamline recurring report creation, significantly reducing work time.

2. Setting Up python-pptx

2.1 Installation Steps

Installing python-pptx is very simple. Just run the following command:
pip install python-pptx
If you don’t have a Python environment set up, you can use conda to create an environment and install the library.

2.2 Basic Structure of python-pptx

Import the library and use the Presentation() class to create a new presentation. This forms the basis of PowerPoint manipulation.
from pptx import Presentation

prs = Presentation()
This code creates a new presentation, preparing it for adding slides and text.

3. Creating and Saving Presentations

3.1 Creating a New Presentation

First, let’s explain how to create and save a presentation using python-pptx. The following code creates and saves a new presentation file:
from pptx import Presentation

prs = Presentation()
prs.save('new_presentation.pptx')
This saves a PowerPoint file in the current directory with the specified name.

3.2 How to Add Slides

To add slides to a presentation, use the add_slide() method. You can choose from 11 layout templates.
slide_layout = prs.slide_layouts[0]  # Select Title Slide
slide = prs.slides.add_slide(slide_layout)
This code adds a new slide based on the specified layout.

4. Manipulating Slide Content

4.1 Inserting and Formatting Text

When inserting text into a slide, use placeholders (for title or subtitle positions). Then, format the text with the TextFrame object. Here’s how to insert and format text:
title = slide.shapes.title
subtitle = slide.placeholders[1]

title.text = "Presentation Title"
subtitle.text = "Subtitle"
You can also change font size and color, or add line breaks:
title.text = "Slide
Auto-generated with Python"

4.2 Adding Images and Shapes

To insert images into a slide, use the add_picture() method. You can also specify position and size.
from pptx.util import Inches

img_path = 'image.png'
left = Inches(1)
top = Inches(2)
slide.shapes.add_picture(img_path, left, top)
Additionally, you can add shapes available in PowerPoint’s shape menu and customize their design:
from pptx.enum.shapes import MSO_SHAPE
shape = slide.shapes.add_shape(MSO_SHAPE.ROUNDED_RECTANGLE, Inches(1), Inches(1), Inches(2), Inches(1))
shape.text = "Text in Shape"
 
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5. Advanced Automation Techniques

5.1 Automatically Generating Slides

You can use loops to automatically generate a large number of slides. For example, when creating a presentation based on data, the following code is useful:
for i in range(10):
    slide_layout = prs.slide_layouts[1]
    slide = prs.slides.add_slide(slide_layout)
    title = slide.shapes.title
    title.text = f"Slide {i+1}"
This code generates 10 slides automatically, each with a sequential number.

5.2 Editing Existing Presentations

You can also load and edit existing PowerPoint files. For example, to update a title, use this code:
prs = Presentation('existing_presentation.pptx')
slide = prs.slides[0]
title = slide.shapes.title
title.text = "Updated Title"
prs.save('updated_presentation.pptx')

6. Improving the Look of Presentations

6.1 Applying Templates

With python-pptx, you can apply design templates to easily create visually appealing presentations. Templates help you achieve a professional look in less time.

6.2 Setting Animations and Transitions

In advanced presentations, you can also set animations and slide transitions. This enhances the visual impact of your slides.

7. Conclusion

python-pptx is a powerful tool that significantly reduces the workload of creating presentations. It is especially suitable for generating a large number of slides at once or creating presentation materials automatically from data. By automating tasks with programming, you can easily create efficient and high-quality presentation materials.
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