Prerequisites: Introduction to tkinter
Tkinter is a standard GUI (Graphical user interface) package for python. It provides a fast and easy way of creating a GUI application.
To create a tkinter application:
- Importing the module — tkinter
- Create the main window (container)
- Add any number of widgets to the main window.
- Apply the event Trigger on the widgets.
Widgets are the controlling tools for any GUI application. Here widget’s main role is to provide a good variety of control. Some widgets are buttons, labels, text boxes, and many more.
One of its widgets is the label, which is responsible for implementing a display box-section for text and images. Click here For knowing more about the Tkinter label widget.
Now, let’ see how To change the text of the label:
Method 1: Using Label.config() method.
Syntax: Label.config(text)
Parameter: text– The text to display in the label.
This method is used for performing an overwriting over label widget.
Example:
Python3
# importing everything from tkinterfrom tkinter import *# creating the tkinter windowMain_window = Tk()# variablemy_text = "Lazyroar updated !!!"# function define for# updating the my_label# widget contentdef counter(): # use global variable global my_text # configure my_label.config(text = my_text)# create a button widget and attached # with counter function my_button = Button(Main_window, text = "Please update", command = counter)# create a Label widgetmy_label = Label(Main_window, text = "neveropen")# place the widgets# in the gui windowmy_label.pack()my_button.pack()# Start the GUIMain_window.mainloop() |
Output:
Method 2: Using StringVar() class.
Syntax: StringVar()
Return: String variable object
This class is used for setting the values and changing it according to the requirements.
Python3
# importing everything from tkinterfrom tkinter import *# create gui windowMain_window = Tk()# set the configuration# of the windowMain_window.geometry("220x100")# define a function# for setting the new textdef java(): my_string_var.set("You must go with Java")# define a function# for setting the new textdef python(): my_string_var.set("You must go with Python")# create a Button widget and attached # with java function btn_1 = Button(Main_window, text = "I love Android", command = java)# create a Button widget and attached # with python functionbtn_2 = Button(Main_window, text = "I love Machine Learning", command = python)# create a StringVar classmy_string_var = StringVar()# set the textmy_string_var.set("What should I learn")# create a label widgetmy_label = Label(Main_window, textvariable = my_string_var)# place widgets into# the gui windowbtn_1.pack()btn_2.pack()my_label.pack()# Start the GUI Main_window.mainloop() |
