Show Number of Selected Objects

show_num_of_selected_objects.py

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# ##### END GPL LICENSE BLOCK #####


bl_info = {
    "name": "Show Number of Selected Objects",
    "author": "todashuta",
    "version": (1, 0, 0),
    "blender": (2, 93, 0),
    "location": "3D View > Object Mode > Tool Header",
    "description": "",
    "warning": "",
    "wiki_url": "",
    "tracker_url": "",
    "category": "Object"
}


import bpy


def drawfunc(self, context):
    active_object = context.active_object
    if active_object and active_object.mode == "OBJECT":
        self.layout.label(text=f"#selected_objects: {len(context.selected_objects)}")


def register():
    bpy.types.VIEW3D_HT_tool_header.prepend(drawfunc)


def unregister():
    bpy.types.VIEW3D_HT_tool_header.remove(drawfunc)


if __name__ == "__main__":
    register()