How to use Application.FileExportConverters in the xlwings API way

The Application.FileExportConverters property in Excel is part of the Excel Object Model and provides access to a collection of file export converters available in the application. These converters are essentially add-ins or built-in features that allow Excel to save or export workbooks in various file formats beyond the default ones, such as PDF, XPS, or other custom formats. In xlwings, this property can be utilized to programmatically inspect and manage the export options available in Excel, enabling automation of export processes and format validation in data analysis and reporting workflows.

Functionality:
The primary function of Application.FileExportConverters is to return an FileExportConverters object, which is a collection of all installed file export converters. Each converter in the collection is represented by a FileExportConverter object, which contains details like the extension, description, and file format ID. This is useful for checking if a specific export format is supported before attempting an export operation, or for listing available formats in a user interface.

Syntax in xlwings:
In xlwings, you access this property through the Application object. The syntax is straightforward, as it maps directly to the Excel Object Model. Here’s how you can call it:

import xlwings as xw

# Connect to the active Excel instance or start a new one
app = xw.App(visible=False) # or xw.App() for visible
export_converters = app.api.FileExportConverters

• app.api: This provides access to the underlying Excel COM object, allowing direct use of Excel’s properties and methods.
• FileExportConverters: This property does not take any parameters. It returns a collection object that you can iterate over or query.

Parameters and Values:
The FileExportConverters property itself has no parameters. However, the returned collection contains FileExportConverter objects, each with properties that can be accessed. Key properties include:

• Extensions: A string representing the file extension associated with the converter (e.g., “pdf”).
• Description: A string describing the converter (e.g., “PDF”).
• FileFormat: A numeric ID representing the file format in Excel constants.

You can retrieve these values by iterating through the collection. For example, to get a list of all available export formats, you can loop through each converter and extract its details.

Code Example:
Here’s a practical xlwings code example that demonstrates how to use Application.FileExportConverters to list all available export converters and their details:

import xlwings as xw

# Start an Excel application instance
app = xw.App(visible=False)

try:
    # Access the FileExportConverters collection
    converters = app.api.FileExportConverters

    # Check if any converters are available
    if converters.Count > 0:
        print("Available File Export Converters:")
        for i in range(1, converters.Count + 1):
            converter = converters.Item(i)
            print(f" - Extension: {converter.Extensions}, Description: {converter.Description}, FileFormat ID: {converter.FileFormat}")
    else:
        print("No file export converters found.")

    # Example: Check if PDF export is supported
    pdf_supported = any(converter.Extensions.lower() == 'pdf' for converter in [converters.Item(j) for j in range(1, converters.Count + 1)])
    print(f"\nPDF export supported: {pdf_supported}")

except Exception as e:
    print(f"An error occurred: {e}")
finally:
    # Close the Excel application
    app.quit()