Creating multiple empty string variables using StringVar() from Tkinter

Question

I need to create a large number of variables that take string input and that initially will be empty (pending user input).

Previously I've created the variables one at the time, eg

customer_id = StringVar() customer_age = StringVar()

etc but this looks messy with a large number of variables.

I've looked at the answer in Issue with 'StringVar' in Python Program but I can't figure out how to use StringVar() with a for loop and a list.

I'm using Python 3.7.4, Windows 10.

# ATTEMPT 
from tkinter import * 
varlist = ['customer_id', 'customer_age', 'customer_phone']               
for var in varlist:
    Tk()
    var = StringVar()

# ERROR MESSAGE WHEN CHECKING VARIABLES
type(customer_id) 

NameError                                 Traceback (most recent call last)
<ipython-input-24-9625f8af3cc2> in <module>
----> 1 type(customer_id)

NameError: name 'customer_id' is not defined

Thanks!

Part of the problem is that you're creating multiple root windows. You need to remove Tk() from the loop. — Bryan Oakley
– Bryan Oakley, Commented Nov 23, 2019 at 15:17

chepner · Accepted Answer · 2019-11-24 13:16:23Z

2

Use a dict.

varlist = {var: StringVar() for var in ["customer_id", "customer_age", "customer_phone"]}

Now use varlist["customer_id"] where you would have used the variable customer_id.

edited Nov 24, 2019 at 13:16

answered Nov 23, 2019 at 13:20

chepner

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2 Comments

Robbie Over a year ago

When I run it I get: File "<ipython-input-6-35d53a43f178>", line 7 varlist = {var: StringVar() for var in "customer_id", "customer_age", "customer_phone"} ^ SyntaxError: invalid syntax

chepner Over a year ago

Fixed; I forgot to wrap the elements in a list literal.

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