1 from Tkinter import *

     2 

     3 #       The way to think about this is that each radio button menu

     4 #       controls a different variable -- clicking on one of the

     5 #       mutually exclusive choices in a radiobutton assigns some value

     6 #       to an application variable you provide. When you define a

     7 #       radiobutton menu choice, you have the option of specifying the

     8 #       name of a varaible and value to assign to that variable when

     9 #       that choice is selected. This clever mechanism relieves you,

    10 #       the programmer, from having to write a dumb callback that

    11 #       probably wouldn't have done anything more than an assignment

    12 #       anyway. The Tkinter options for this follow their Tk

    13 #       counterparts:

    14 #       {"variable" : my_flavor_variable, "value" : "strawberry"}

    15 #       where my_flavor_variable is an instance of one of the

    16 #       subclasses of Variable, provided in Tkinter.py (there is

    17 #       StringVar(), IntVar(), DoubleVar() and BooleanVar() to choose

    18 #       from)

    19 

    20 

    21 

    22 def makePoliticalParties(var):

    23     # make menu button

    24     Radiobutton_button = Menubutton(mBar, text='Political Party',

    25                                     underline=0)

    26     Radiobutton_button.pack(side=LEFT, padx='2m')

    27 

    28     # the primary pulldown

    29     Radiobutton_button.menu = Menu(Radiobutton_button)

    30 

    31     Radiobutton_button.menu.add_radiobutton(label='Republican',

    32                                             variable=var, value=1)

    33 

    34     Radiobutton_button.menu.add('radiobutton', {'label': 'Democrat',

    35                                                 'variable' : var,

    36                                                 'value' : 2})

    37 

    38     Radiobutton_button.menu.add('radiobutton', {'label': 'Libertarian',

    39                                                 'variable' : var,

    40                                                 'value' : 3})

    41 

    42     var.set(2)

    43 

    44     # set up a pointer from the file menubutton back to the file menu

    45     Radiobutton_button['menu'] = Radiobutton_button.menu

    46 

    47     return Radiobutton_button

    48 

    49 

    50 def makeFlavors(var):

    51     # make menu button

    52     Radiobutton_button = Menubutton(mBar, text='Flavors',

    53                                     underline=0)

    54     Radiobutton_button.pack(side=LEFT, padx='2m')

    55 

    56     # the primary pulldown

    57     Radiobutton_button.menu = Menu(Radiobutton_button)

    58 

    59     Radiobutton_button.menu.add_radiobutton(label='Strawberry',

    60                                             variable=var, value='Strawberry')

    61 

    62     Radiobutton_button.menu.add_radiobutton(label='Chocolate',

    63                                             variable=var, value='Chocolate')

    64 

    65     Radiobutton_button.menu.add_radiobutton(label='Rocky Road',

    66                                             variable=var, value='Rocky Road')

    67 

    68     # choose a default

    69     var.set("Chocolate")

    70 

    71     # set up a pointer from the file menubutton back to the file menu

    72     Radiobutton_button['menu'] = Radiobutton_button.menu

    73 

    74     return Radiobutton_button

    75 

    76 

    77 def printStuff():

    78     print "party is", party.get()

    79     print "flavor is", flavor.get()

    80     print

    81 

    82 #################################################

    83 #### Main starts here ...

    84 root = Tk()

    85 

    86 

    87 # make a menu bar

    88 mBar = Frame(root, relief=RAISED, borderwidth=2)

    89 mBar.pack(fill=X)

    90 

    91 # make two application variables,

    92 # one to control each radio button set

    93 party = IntVar()

    94 flavor = StringVar()

    95 

    96 Radiobutton_button = makePoliticalParties(party)

    97 Radiobutton_button2 = makeFlavors(flavor)

    98 

    99 # finally, install the buttons in the menu bar.

   100 # This allows for scanning from one menubutton to the next.

   101 mBar.tk_menuBar(Radiobutton_button, Radiobutton_button2)

   102 

   103 b = Button(root, text="print party and flavor", foreground="red",

   104            command=printStuff)

   105 b.pack(side=TOP)

   106 

   107 root.title('menu demo')

   108 root.iconname('menu demo')

   109 

   110 root.mainloop()