Blender Simple Operator newbie question

i’ve started learning scripting so i can automate tedious and repetitive tasks.

i have zero experience in coding whatsoever but i can figure out most of what’s in the Simple Operator in Blender scripting. (Templates/Python/Operator Simple)

but i have no idea what the lines of codes below mean.
could someone shed some light and explain in plain English what this does?
it seems to do no harm if i just leave it alone, but i’m curious.

(line #31)

if __name__ == "__main__":
    register()
if __name__ == "__main__":

Is a condition that is True only when the script is being executed directly.

You should really start with some basic Python tutorials before jumping directly into working with the Blender API. It’ll save you a lot of time in the long run.

i see, tnx a lot for taking the time!

i’ve managed to create my first addon, which is for my own personal use.
while i’d like to get deeper into this stuff, i have unfortunately a lot more times behind me than what’s ahead.
so i got to carefully pick what battles i want to fight. ; )

If the script is imported from another module, then __name__ != "__main__" and register() will not be called.
This is something that is common to use in Python to prevent a module to execute automatically while being imported, but still run if it’s called directly.

tnx mate! : )

if anyone wants to take a look at the code below, it works and i think it’s legit. ; )
it works from Object mode.
it’s 2 operators; the first one shades from flat to smooth, turns Auto-Smooth on and sets it at 180, then selects and Mark Sharp edges.
the other operator is to ‘undo’ the whole thing:

bl_info = {
    "name": "Smooth",
    "author": "moontan",
    "version": (1, 0),
    "blender": (2, 80, 0),
    "location": "",
    "description": "Smooth",
    "warning": "",
    "wiki_url": "",
    "category": "",
}


import bpy

def main_01(context):
    bpy.ops.object.shade_smooth()
    bpy.context.object.data.use_auto_smooth = True
    bpy.context.object.data.auto_smooth_angle = 3.14159
    bpy.ops.object.editmode_toggle()
    bpy.ops.mesh.edges_select_sharp()
    bpy.ops.mesh.mark_sharp()
    bpy.ops.object.editmode_toggle()


class AddSmooth(bpy.types.Operator):
    """Tooltip"""
    bl_idname = "moontan.add_smooth"
    bl_label = "Add Smooth"

    def execute(self, context):
        main_01(context)
        return {'FINISHED'}

def main_02(context):
	bpy.ops.object.editmode_toggle()
	bpy.ops.mesh.select_all(action='SELECT')
	bpy.ops.mesh.mark_sharp(clear=True)
	bpy.ops.object.editmode_toggle()
	bpy.ops.object.shade_flat()
	bpy.context.object.data.use_auto_smooth = False

class ClearSmooth(bpy.types.Operator):
    """Tooltip"""
    bl_idname = "moontan.clear_smooth"
    bl_label = "Clear Smooth"

    def execute(self, context):
        main_02(context)
        return {'FINISHED'}

def register():
    bpy.utils.register_class(AddSmooth)
    bpy.utils.register_class(ClearSmooth)


def unregister():
    bpy.utils.unregister_class(AddSmooth)
    bpy.utils.unregister_class(ClearSmooth)


if __name__ == "__main__":
    register()

    # test call
    # bpy.ops.moontan.add_smooth()
    # bpy.ops.moontan.clear_smooth()