GroupDocs.Assembly for Python via .NET Overview Leave feedback

GroupDocs.Assembly for Python via .NET is a native Python library for document automation: it builds reports and documents from templates. A template is an ordinary Word, Excel, PowerPoint, OpenDocument, email, HTML, Markdown or text document in which tags such as <<[customer.Name]>> and <<foreach [o in orders]>> mark where the data goes. GroupDocs.Assembly fills the tags with your data - Python dicts and lists, JSON, XML and CSV files, or the tables of other documents - and saves the report in the template’s format or another one, such as PDF. No Microsoft Office installation is required.

Typical uses include:

• Business documents - invoices, contracts, offers and letters from one template per document type.
• Reports - tables, lists and charts of sales, orders or any other data, with totals, grouping, filtering and sorting done in the template.
• Email - messages whose recipients, subject and body come from data.
• Mail merge - one document per customer, employee or record.

Fill a Word template with the orders of a customer from a JSON file, and save the report as PDF:

import json

from groupdocs.assembly import DataSourceInfo, DocumentAssembler

def quick_example():
    # The data: one customer and its orders, read from JSON into a dict
    with open("customer.json", encoding="utf-8") as f:
        customer = json.load(f)

    # Fill the template's tags and save the report as PDF
    assembler = DocumentAssembler()
    assembler.assemble_document("customer-summary.docx", "customer-summary.pdf", DataSourceInfo(customer, "customer"))
    print("Orders in the report:", len(customer["Order"]))

if __name__ == "__main__":
    quick_example()

Binary file (PDF, 37 KB)

The template holds the customer’s name and address, a table whose row repeats for each order, and the total:

<<[customer.CustomerName]>>
<<[customer.ShippingAddress]>>, <<[customer.CustomerContactNumber]>>
| Product                                              | Quantity                  | Price, USD                    |
| <<foreach [o in customer.Order]>><<[o.Product.ProductName]>> | <<[o.ProductQuantity]>> | <<[o.Price]>><</foreach>> |
Total: <<[customer.Order.Sum(o => o.Price)]>> USD

• Hello, World! and the Quick Start Guide - your first reports.
• Features Overview - everything GroupDocs.Assembly can do, with links to each topic.
• Developer Guide - the template syntax, the data sources and every kind of report.
• API Reference - the classes and their members.
• AI agents and LLM integration - the package’s AGENTS.md and the documentation for AI coding assistants.