from tkinter import *
 
class MainWnd:
    def __init__(self,Frame): 
        self.SelectName = StringVar()
        self.Names = ["aa","bb"]
        self.OptModuleName = OptionMenu(app,self.SelectName,*self.Names,command=self.SelectModule)
        self.OptModuleName.pack()
        self.BtnUpdate = Button(app, text="Update",command=self.Update)
        self.BtnUpdate.pack()
    def SelectModule(self,value):
        print("choose",value)
    def Update(self):
        print("Update Obtion Menu")
        self.OptModuleName['menu'].delete(0,'end')
        self.Names.clear()
        self.Names = ["cc","dd"]
        for Item in self.Names:
            self.OptModuleName['menu'].add_command(label=Item,command=self.SelectModule)
app = Tk()
app.geometry('300x200')
MainWindows = MainWnd(app)
app.mainloop()
 

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