{"id":7324,"date":"2025-04-01T03:09:58","date_gmt":"2025-04-01T03:09:58","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=7324"},"modified":"2025-04-01T03:53:16","modified_gmt":"2025-04-01T03:53:16","slug":"tkinter-intvar","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/tkinter\/tkinter-intvar\/","title":{"rendered":"Tkinter IntVar"},"content":{"rendered":"\n

Summary<\/strong>: In this tutorial, you’ll learn how to link widgets with Python variables using the Tkinter IntVar<\/code> objects.<\/p>\n\n\n\n

Introduction to the Tkinter IntVar #<\/a><\/h2>\n\n\n\n

In Tkinter, the IntVar<\/code> class allows you to create integer variable objects.<\/p>\n\n\n\n

An IntVar<\/code> object holds an integer value. Tkinter links an IntVar<\/code> object with a widget, such as an entry<\/a>, checkbox<\/a>, or radio button<\/a>.<\/p>\n\n\n\n

By using IntVar<\/code> objects, you can dynamically manage the widget’s values in Python.<\/p>\n\n\n\n

Creating and Associating an IntVar Object with a Widget #<\/a><\/h3>\n\n\n\n

Here are the steps for using the IntVar<\/code> objects:<\/p>\n\n\n\n

First, import the tkinter<\/code> module:<\/p>\n\n\n

import<\/span> tkinter as<\/span> tk<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Second, create a new IntVar<\/code> object:<\/p>\n\n\n
quantity_var = tk.IntVar()<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Third, associate the int_var<\/code> object with a widget. For example, you can associate it with an entry widget:<\/p>\n\n\n
quantity_entry = ttk.Entry(root, textvariable=quantity_var)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Accessing and Changing IntVar Value #<\/a><\/h3>\n\n\n\n
Since the IntVar<\/code> object is already associated with the entry widget, you can get the current value of the entry widget using the IntVar<\/code> object:<\/p>\n\n\n
current_value = int_var.get()<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
You can also change the value of the entry widget via the IntVar<\/code> object using the set<\/code> function:<\/p>\n\n\n
int_var.set(20<\/span>)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Tracing Values #<\/a><\/h3>\n\n\n\n
If you want to execute a function when the value of an IntVar<\/code> changes, you can use the trace_add<\/code> method:<\/p>\n\n\n
int_var.trace_add(mode, callback)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
The trace_add()<\/code> method accepts two parameters:<\/p>\n\n\n\n