[Python] How to Generate a Flowchart with Swimlanes and Export to Visio Using Python?

Title: Why aren't shapes appearing in my generated Visio file using the vsdx Python library?

Description:

I'm working with the vsdx Python library to generate a flowchart and export it to Visio. My goal is to add new shapes to the Visio file and update existing ones. I've attempted the following:

1. Opened an existing Visio file (Flowchart_Walmart.vsdx).
2. Updated the text of an existing shape using find_shape_by_text.
3. Created and added a new shape with XML using Element and SubElement.

However, the shapes I'm trying to add are not visible in the generated Visio file. Here's the code I used:

filename = "Flowchart_Walmart.vsdx"
new_file = "diagram_with_shapes.vsdx"

# Open the copied Visio file
with VisioFile(filename) as v:
page = v.pages[0] # Get the first page

# Find an existing shape and update its text
existing_shape = page.find_shape_by_text(text="Is the customer new or existing?")
if existing_shape:
existing_shape.text = "Updated: Is the customer new or existing?"
existing_shape.shape_type = "Process"

# Create a new shape
shape_xml = Element("Shape", {"ID": "100", "name": "Process", "type": "Shape"}) # Ensure unique ID
text_element = SubElement(shape_xml, "Text")
text_element.text = "New Shape Added"

# Convert to VisioShape and add to page
new_shape = Shape(xml=shape_xml, parent=page, page=page)
page.shapes.append(new_shape)

# Save the updated Visio file
v.save_vsdx(new_file)


When I open the generated file, the new shape does not appear on the Visio diagram. The updated shape text also doesn't reflect the changes.

Here are the issues I suspect:

• The new shape may not be properly added to the shapes list or rendered on the page.
• The XML structure for the new shape might be missing required elements or attributes.
• There could be additional steps needed for the vsdx library to register and render new shapes.

Could someone please help me understand:

1. Why the new shape is not showing up in the generated file?
2. If additional steps are required to properly add and render shapes in Visio using the vsdx library?
3. Are there better alternatives or workarounds for creating flowcharts in Python and exporting them to Visio?

I am trying to generate a Visio file that contains flowchart shapes like Process, Decision, etc., along with the connections between nodes. However, the output I generated is a plain Visio file that does not contain any shapes. Can anyone please provide a solution or suggest corrections to my current approach?

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