I will continue the series of tutorials with python and the Blender 3D software interface.
From the main menu we can get to the scripting part and here we choose Templates - Python - Ui Panel Simple.
The source code will be added to the python editor.
Save this source code with a name and load it as an addon.
After loading this source code it can be found at Properties at Object, see screenshot.

You can see the source code from the Ui Panel Simple template that I used.
import bpy
class HelloWorldPanel(bpy.types.Panel):
"""Creates a Panel in the Object properties window"""
bl_label = "Hello World Panel"
bl_idname = "OBJECT_PT_hello"
bl_space_type = 'PROPERTIES'
bl_region_type = 'WINDOW'
bl_context = "object"
def draw(self, context):
layout = self.layout
obj = context.object
row = layout.row()
row.label(text="Hello world!", icon='WORLD_DATA')
row = layout.row()
row.label(text="Active object is: " + obj.name)
row = layout.row()
row.prop(obj, "name")
row = layout.row()
row.operator("mesh.primitive_cube_add")
def register():
bpy.utils.register_class(HelloWorldPanel)
def unregister():
bpy.utils.unregister_class(HelloWorldPanel)
if __name__ == "__main__":
register()