How to use Workbooks.Parent in the xlwings API way

The Parent property of the Workbooks object in Excel’s object model is a read-only property that returns the parent object for the specified collection. In the context of the Workbooks collection, the parent is the Excel Application object itself. This property is useful when you need to access application-level settings, methods, or properties from a workbook context, such as adjusting application settings or retrieving the application version. In xlwings, this property is accessible through the api property, which provides direct access to the underlying Excel object model, allowing for precise control and integration with Excel’s native features.

Functionality:
The primary function of the Parent property is to provide a reference to the Excel Application object that contains the Workbooks collection. This enables developers to perform operations at the application level, such as:

• Changing global Excel settings (e.g., ScreenUpdating, Calculation).
• Accessing other application-level collections like AddIns.
• Retrieving application information (e.g., Version, UserName).

Syntax:
In xlwings, the syntax to access the Parent property of the Workbooks object is as follows:

app = xw.books.api.Parent

• app: This variable will hold a reference to the Excel Application object.
• xw.books: This refers to the Workbooks collection in xlwings.
• .api: This provides the underlying COM object, exposing the native Excel object model.
• .Parent: This is the property being called, returning the parent Application object.

No parameters are required for this property as it is read-only and does not accept arguments.

Code Examples:
Below are practical examples demonstrating the use of the Parent property in xlwings:

1. Accessing Application Properties:
   This example shows how to retrieve the Excel application’s version and user name using the Parent property.

import xlwings as xw

# Connect to the active Excel instance
app = xw.apps.active

# Get the Workbooks collection's parent (Application)
excel_app = xw.books.api.Parent

# Access application-level properties
version = excel_app.Version
user_name = excel_app.UserName

print(f"Excel Version: {version}")
print(f"Current User: {user_name}")

2. Modifying Application Settings:
   This example illustrates how to toggle the ScreenUpdating property to improve performance during macro execution.

import xlwings as xw

# Start or connect to Excel
app = xw.App(visible=True)

# Access the parent Application from Workbooks
excel_app = xw.books.api.Parent

# Disable screen updating for faster execution
excel_app.ScreenUpdating = False

# Perform data operations (e.g., adding a new workbook)
wb = xw.books.add()
wb.sheets[0].range("A1").value = "Data loaded..."

# Re-enable screen updating
excel_app.ScreenUpdating = True

# Save and close
wb.save("output.xlsx")
wb.close()
app.quit()

3. Iterating Through Open Workbooks:
   This example uses the Parent property to list all open workbooks by accessing the Workbooks collection from the Application object.

import xlwings as xw

# Ensure Excel is running
if not xw.apps:
    xw.App(visible=True)

# Get the Application object via Parent
excel_app = xw.books.api.Parent

# Loop through all workbooks in the application
for wb in excel_app.Workbooks:
    print(f"Workbook Name: {wb.Name}")

# This provides a direct way to manage workbooks at the application level.