How do I enable multiple selection of values from a combobox?

Python 3.4.3, Windows 10, Tkinter

I am attempting to create a combobox that allows for multiple selections from the dropdown. I have found similar work for listbox (Python Tkinter multiple selection Listbox), but cannot get it work with the combobox.

Is there a simple way to enable multiple selection from the dropdown of the combobox?

By design the ttk combobox doesn't support multiple selections. It is designed to allow you to pick one item from a list of choices.

If you need to be able to make multiple choices you can use a menubutton with an associated menu, and add checkbuttons or radiobuttons to the menu.

Here's an example:

import Tkinter as tk

class Example(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)

        menubutton = tk.Menubutton(self, text="Choose wisely", 
                                   indicatoron=True, borderwidth=1, relief="raised")
        menu = tk.Menu(menubutton, tearoff=False)
        menubutton.configure(menu=menu)
        menubutton.pack(padx=10, pady=10)

        self.choices = {}
        for choice in ("Iron Man", "Superman", "Batman"):
            self.choices[choice] = tk.IntVar(value=0)
            menu.add_checkbutton(label=choice, variable=self.choices[choice], 
                                 onvalue=1, offvalue=0, 
                                 command=self.printValues)
    def printValues(self):
        for name, var in self.choices.items():
            print "%s: %s" % (name, var.get())

if __name__ == "__main__":
    root = tk.Tk()
    Example(root).pack(fill="both", expand=True)
    root.mainloop()