[Blender Python] basic UI list pane (explanation https://www.skool.com/cgpython/ui-guide?p=47cf4527)

basic_ui_list_panel.py

import random

import bpy

# Define a custom property group for our list items
class MyItem(bpy.types.PropertyGroup):
    name: bpy.props.StringProperty(name="Item Name", default="New Item")
    number: bpy.props.IntProperty(name="Item Number", default=0)


class AddItemOperator(bpy.types.Operator):
    """Operator to add an item to the collection"""
    bl_idname = "my_list.add_item"
    bl_label = "Add Item"
    
    def execute(self, context):
        item = context.scene.my_collection.add()
        item.name = f"Item {len(context.scene.my_collection)}"
        item.number = random.randint(0, 100)
        return {'FINISHED'}


class RemoveItemOperator(bpy.types.Operator):
    """Operator to remove an item from the collection"""
    bl_idname = "my_list.remove_item"
    bl_label = "Remove Item"
    
    index: bpy.props.IntProperty()
    
    def execute(self, context):
        collection = context.scene.my_collection
        if 0 <= self.index < len(collection):
            collection.remove(self.index)
        return {'FINISHED'}


class MY_UL_List(bpy.types.UIList):
    """UIList for displaying items"""
    def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
        if self.layout_type in {'DEFAULT', 'COMPACT'}:
            row = layout.row(align=True)
            row.prop(item, "name", text="", emboss=False)
            row.prop(item, "number", text="", emboss=False)
        elif self.layout_type == 'GRID':
            layout.label(text="")


# Create a panel to display the list and buttons
class MY_PT_Panel(bpy.types.Panel):
    """Panel in the Scene Props"""
    bl_label = "My Custom List Panel 33"
    bl_idname = "MY_PT_panel"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = 'scene'
    
    def draw(self, context):
        layout = self.layout
        scene = context.scene
        
        # Draw the list
        layout.template_list("MY_UL_List", "", scene, "my_collection", scene, "my_collection_index")
        
        # Draw the add and remove buttons
        row = layout.row()
        row.operator("my_list.add_item", icon='ADD', text="Add")
        remove_op = row.operator("my_list.remove_item", icon='REMOVE', text="Remove")
        remove_op.index = scene.my_collection_index


# Register the custom property, classes, and operators
classes = [
    MyItem,
    AddItemOperator,
    RemoveItemOperator,
    MY_UL_List,
    MY_PT_Panel
]

def register():
    for cls in classes:
        bpy.utils.register_class(cls)
    bpy.types.Scene.my_collection = bpy.props.CollectionProperty(type=MyItem)
    bpy.types.Scene.my_collection_index = bpy.props.IntProperty()

def unregister():
    for cls in reversed(classes):
        bpy.utils.unregister_class(cls)
    del bpy.types.Scene.my_collection
    del bpy.types.Scene.my_collection_index

if __name__ == "__main__":
    register()