A example of an addon that logs into a file

File Logging Addon example.py

bl_info = {
    "name": "File Logging Addon",
    "description": "Creates a panel with three buttons that add a cube, cone, and sphere to the scene. Logs messages to a file.",
    "author": "Viktor Stepanov",
    "version": (0, 0, 1),
    "blender": (4, 0, 0),
    "location": "View3D",
    "warning": "This addon is still in development.",
    "wiki_url": "",
    "category": "Object"
}


import bpy
import logging
import os

# Configure logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

# Create file handler
log_file = os.path.join(os.path.dirname(__file__), "addon.log")
file_handler = logging.FileHandler(log_file)
file_handler.setLevel(logging.DEBUG)

# Create formatter and add it to the file handler
formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
file_handler.setFormatter(formatter)

# Add the file handler to the logger
logger.addHandler(file_handler)

# Custom operators
class Operator1(bpy.types.Operator):
    bl_idname = "object.add_mesh1"
    bl_label = "Add Cube"

    def execute(self, context):
        logger.info("Executing Operator 1")
        logger.debug("Adding a cube to the scene")
        bpy.ops.mesh.primitive_cube_add(size=2)
        return {'FINISHED'}

class Operator2(bpy.types.Operator):
    bl_idname = "object.add_mesh2"
    bl_label = "Add Cone"

    def execute(self, context):
        logger.info("Executing Operator 2")
        logger.debug("Adding a cone to the scene")
        bpy.ops.mesh.primitive_cone_add(vertices=8, radius1=1, depth=2)
        return {'FINISHED'}

class Operator3(bpy.types.Operator):
    bl_idname = "object.add_mesh3"
    bl_label = "Add Sphere"

    def execute(self, context):
        logger.info("Executing Operator 3")
        logger.debug("Adding a sphere to the scene")
        bpy.ops.mesh.primitive_uv_sphere_add(radius=1)
        return {'FINISHED'}

# Panel
class CustomPanel(bpy.types.Panel):
    bl_label = "Custom Panel"
    bl_idname = "OBJECT_PT_custom_panel"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = 'Custom'

    def draw(self, context):
        logger.debug("Drawing the custom panel")
        layout = self.layout

        row = layout.row()
        row.operator("object.add_mesh1")

        row = layout.row()
        row.operator("object.add_mesh2")

        row = layout.row()
        row.operator("object.add_mesh3")

# Register the operators and panel
classes = (Operator1, Operator2, Operator3, CustomPanel)

def register():
    logger.info("Registering the %s addon", __name__)
    for cls in classes:
        logger.debug("Registering class: %s", cls)
        bpy.utils.register_class(cls)

def unregister():
    logger.info("Unregistering the %s addon", __name__)
    for cls in classes:
        logger.debug("Unregistering class: %s", cls)
        bpy.utils.unregister_class(cls)

if __name__ == "__main__":
    register()