Blender ２.８でアドオンを作ってみる

import bpy

##############################################

# ボタンを定義
class ConeButton(bpy.types.Operator):
  bl_idname = "szl.button"
  bl_label = "Add a CONE"
  
  def execute(self, context):
    bpy.ops.mesh.primitive_cone_add()
    return{'FINISHED'}


##############################################

# パネルの項目を定義
class ConeUI(bpy.types.Panel):
  bl_label = "panel title"
  bl_space_type = "VIEW_3D"
  bl_region_type = "UI"
  bl_category = "AddConePanel"
  
  def draw(self, context):
    self.layout.operator("szl.button")

##############################################
    
classes = (
  ConeUI,
  ConeButton
)

##############################################

# アドオン有効化時に呼び出される
def register():
  for c in classes:
    bpy.utils.register_class(c)

# アドオン無効化時に呼び出される
def unregister():
  for c in classes:
    bpy.utils.unregister_class(c)


if __name__ == "__main__":
  register()
 

import bpy

##############################################

bl_info = {
    "name"       : "sample: add-on-name",
    "author"     : "yodori soratori",
    "version"    : (1, 0),
    "blender"    : (2, 81, 0),
    "location"   : "location",
    "description": "sample",
    "warning"    : "warning message", # 空だと！アイコンが出ない
    "support"    : "TESTING",         # または OFFICIAL または COMMUNITY 
    "wiki_url"   : "",
    "tracker_url": "",
    "category"   : "Object"           #アドオンのカテゴリ
}


##############################################

# ボタンを定義
class ConeButton(bpy.types.Operator):
  bl_idname = "szl.button"
  bl_label = "Add a CONE"
  
  def execute(self, context):
    bpy.ops.mesh.primitive_cone_add()
    return{'FINISHED'}


##############################################

# 
class ConeUI(bpy.types.Panel):
  bl_label = "panel title"
  bl_space_type = "VIEW_3D"
  bl_region_type = "UI"
  bl_category = "AddConePanel"
  
  def draw(self, context):
    self.layout.operator("szl.button")

##############################################
    
classes = (
  ConeUI,
  ConeButton
)

##############################################

# アドオン有効化時に呼び出される
def register():
  for c in classes:
    bpy.utils.register_class(c)

# アドオン無効化時に呼び出される
def unregister():
  for c in classes:
      bpy.utils.unregister_class(c)
      

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