panel menu looping n times ?

i did a small operators panel and check out the number of times it’s being executed

after doing a selection in menu from panel
i can see it being run like 3 or 4 times before stopping

so is there a way to run it only ounce?

i got some script functions with lot’s of calculations which takes times
so if this is run more then ounce then it’s gone take a lot of time to get results ?

here is the little test script i did

import bpy
from bpy.props import *
# For the non-operator menus, define their values like this:
bpy.types.Scene.EnumProperty(attr='method', name='Method', items=(
    ('1', 'One', 'The first item'),
    ('2', 'Two', 'The second item'),
    ('3', 'Three', 'The third item')), default='1')
# These are stored in the .blend
# And for one without a label before it make the first element the name
bpy.types.Scene.EnumProperty(attr='nameless', items=(
    ('0', 'Choose one', 'Choose one'),
    ('1', 'One', 'The first item'),
    ('2', 'Two', 'The second item'),
    ('3', 'Three', 'The third item')), default='1')
# For the operator menu this variable just stores the last operation called
last_method = 'None'
class myPanel(bpy.types.Panel):                        # This is the panel
    bl_label = "Data here"                        # Called this
    bl_space_type = "VIEW_3D"                            # in 3D view
#    bl_region_type = "TOOLS"                            # in tool shelf
    bl_region_type = "TOOL_PROPS"    
    def draw(self, context):
        global last_method                            # make this global to find the last operation
        layout = self.layout
        col = layout.column()
        col.label(' Menu fo rDATA:', 'LAMP_DATA')
        col.operator_menu_enum('view_3d.my_operator', 'method', 'Menu Selection')
                                                                        # Here the operator menu is displayed
                                                                        # 'view_3d.my_operator' is the bl_idname of the operator called
        col.label(' Last: ' + last_method, 'QUESTION')
        print ('Method =',last_method,' Val =',eval(last_method))
        if eval(last_method)==1:
            col.label(' Polar Graph', 'FCURVE')
            print (' selected polar graph1')
        elif last_method==2:
class myOperator(bpy.types.Operator):                                # When an option in the operator menu is clicked, this is called
    bl_idname = 'view_3d.my_operator'
    bl_label = 'Operator'
    # Define possible operations
    method = EnumProperty(items=(
        ('1', 'Polar Graph', 'The first item'),
        ('2', 'Lu Curve', 'The second item'),
        ('3', 'Lamps', 'The third item')))
    def execute(self, context):
        global last_method                                            # Make global so we can later draw it in the panel
        last_method =                        # Store the choosen operation
        return {'FINISHED'}
def register():
def unregister():
if __name__ == "__main__":

i added some print to show on the console
and after selecting in menu you can see several loop !

Thanks for any help

anybody ahs any idea how to solvfe this looping problem for panel?

Thanks and happy 2.5