Assigning variables using choices in TKInter dropdown menu - Python 2.7

Question

I would like to be able to create a dropdown list, and assign each choice in the list a different variable. When the option is selected from the dropdown, I would like an entry box to display the associated variable, not the name of the option.

In my program a dropdown list contains a list of people. Each person is a different age. How do I select the person using the dropdown and then have their age display in the entry box?

As you can see below I have entered the choices in this format name*age. I was hoping to try and split by the * and then select the age. I tried specifying the text of the entry box using: text = ((var.get()).split('*')[1]) but this did not work.

Please let me know if there is a way to achieve this.

from Tkinter import *
import Tkinter as ttk 
from ttk import *

root = Tk()
root.title("Age Selector")

mainframe = Frame(root)                                 
mainframe.grid(column=0,row=0, sticky=(N,W,E,S) )
mainframe.columnconfigure(0, weight = 1)
mainframe.rowconfigure(0, weight = 1)
mainframe.pack(pady = 10, padx = 10)

var = StringVar(root)

var.set('Bob')

choices = ['Bob*35', 'Garry*45', 'John*32', 'Hank*65','Tyrone*21']

option = OptionMenu(mainframe, var, *choices)

option.grid(row = 1, column =1)

Label(mainframe, text="Age").grid(row = 2, column = 1)

age = StringVar()
age_ent = Entry(mainframe, text = var, width = 15).grid(column =      2, row = 2)

root.mainloop()

alkey · Accepted Answer · 2013-08-22 14:14:24Z

3

Try following code. Read a comment I added.

from Tkinter import *
import Tkinter as ttk 
from ttk import *

root = Tk()
root.title("Age Selector")

mainframe = Frame(root)                                 
mainframe.grid(column=0,row=0, sticky=(N,W,E,S) )
mainframe.columnconfigure(0, weight = 1)
mainframe.rowconfigure(0, weight = 1)
mainframe.pack(pady = 10, padx = 10)

var = StringVar(root)

# Use dictionary to map names to ages.
choices = {
    'Bob': '35',
    'Garry': '45',
    'John': '32',
    'Hank': '64',
    'Tyrone': '21',
}

option = OptionMenu(mainframe, var, *choices)
var.set('Bob')

option.grid(row = 1, column =1)

Label(mainframe, text="Age").grid(row = 2, column = 1)

age = StringVar()
# Bind age instead of var
age_ent = Entry(mainframe, text=age, width = 15).grid(column = 2, row = 2)

# change_age is called on var change.
def change_age(*args):
    age_ = choices[var.get()]
    age.set(age_)
# trace the change of var
var.trace('w', change_age)

root.mainloop()

According to the documentation:

trace(mode, callback) => string

Add a variable observer. Returns the internal name of the observer (you can use this to unregister the observer; see below).

The mode argument is one of “r” (call observer when variable is read by someone), “w” (call when variable is written by someone), or “u” (undefine; call when the variable is deleted).

edited Aug 22, 2013 at 14:14

alkey

1,0646 gold badges18 silver badges36 bronze badges

answered Aug 22, 2013 at 12:53

falsetru

371k69 gold badges769 silver badges659 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

alkey Over a year ago

Thanks very much for this, is there anyway that I can display the name without the *age in the dropdown list also? I also do not understand how the code knows which part is the age and which part is the name. If you could explain I would very much appreciate it. Thanks

falsetru Over a year ago

@allankey, I updated the code. used a dictionary to names to ages.

alkey Over a year ago

Genius, thanks very much for your help! I just had to change the dictionary lookup because there is no longer a need to split the returned value.

falsetru Over a year ago

@allankey, I saw the mark wrong. I think i wrote comment to wrong answer. I am sorry. Deleting my previous comment.

Collectives™ on Stack Overflow

Assigning variables using choices in TKInter dropdown menu - Python 2.7

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related