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A “Hello, World!” example is often the first step when exploring GroupDocs.Annotation for Python via .NET. It serves as a simple test to confirm that your development environment is correctly set up and that the library is functioning as expected.

GroupDocs.Annotation for Python via .NET lets you add annotations, markup, and review comments to a wide range of document and image formats. A wide range of supported formats makes it versatile for different use cases.

The following steps demonstrate how to add an annotation to a document using GroupDocs.Annotation for Python via .NET:

1. Import the groupdocs.annotation classes you need.
2. Create an annotation and configure it (here, an area annotation with a yellow fill).
3. Open the document with an Annotator, pointing it at the sample file.
4. Add the annotation.
5. Save the result.

The example below adds a yellow area (rectangle) annotation to the first page of a PDF and saves the annotated document:

from groupdocs.annotation import Annotator
from groupdocs.annotation.models import Rectangle
from groupdocs.annotation.models.annotation_models import AreaAnnotation
from groupdocs.pydrawing import Color

def hello_world():
    # Describe a yellow area (rectangle) annotation on the first page
    area = AreaAnnotation()
    area.box = Rectangle(100, 100, 100, 100)          # x, y, width, height
    area.background_color = Color.yellow.to_argb()     # packed ARGB int, not a Color object
    area.page_number = 0                               # page numbers are 0-based
    area.message = "Welcome to GroupDocs.Annotation!"

    # Open the document, add the annotation, and save the result
    with Annotator("./sample.pdf") as annotator:
        annotator.add(area)
        annotator.save("./output.pdf")

    print("Annotation added successfully. Output saved to ./output.pdf.")

if __name__ == "__main__":
    hello_world()

Binary file (PDF)

This example writes the annotated document to output.pdf. Colors are passed as packed ARGB integers (for example Color.yellow.to_argb()), not as Color objects, and page numbers are 0-based, so page_number = 0 targets the first page. To annotate a different format, simply open a file with another extension — the same code works across every supported format.

This demo references the GroupDocs.Annotation for Python via .NET code samples.