
- Python 3 Basic Tutorial
- Python 3 - Home
- What is New in Python 3
- Python 3 - Overview
- Python 3 - Environment Setup
- Python 3 - Basic Syntax
- Python 3 - Variable Types
- Python 3 - Basic Operators
- Python 3 - Decision Making
- Python 3 - Loops
- Python 3 - Numbers
- Python 3 - Strings
- Python 3 - Lists
- Python 3 - Tuples
- Python 3 - Dictionary
- Python 3 - Date & Time
- Python 3 - Functions
- Python 3 - Modules
- Python 3 - Files I/O
- Python 3 - Exceptions
- Python 3 Advanced Tutorial
- Python 3 - Classes/Objects
- Python 3 - Reg Expressions
- Python 3 - CGI Programming
- Python 3 - Database Access
- Python 3 - Networking
- Python 3 - Sending Email
- Python 3 - Multithreading
- Python 3 - XML Processing
- Python 3 - GUI Programming
- Python 3 - Further Extensions
- Python 3 Useful Resources
- Python 3 - Questions and Answers
- Python 3 - Quick Guide
- Python 3 - Tools/Utilities
- Python 3 - Useful Resources
- Python 3 - Discussion
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Python 3 - Tkinter Button
The Button widget is used to add buttons in a Python application. These buttons can display text or images that convey the purpose of the buttons. You can attach a function or a method to a button which is called automatically when you click the button.
Syntax
Here is the simple syntax to create this widget −
w = Button ( master, option = value, ... )
Parameters
master − This represents the parent window.
options − Here is the list of most commonly used options for this widget. These options can be used as key-value pairs separated by commas.
Sr.No. | Option & Description |
---|---|
1 | activebackground Background color when the button is under the cursor. |
2 | activeforeground Foreground color when the button is under the cursor. |
3 | bd Border width in pixels. Default is 2. |
4 | bg Normal background color. |
5 | command Function or method to be called when the button is clicked. |
6 | fg Normal foreground (text) color. |
7 | font Text font to be used for the button's label. |
8 | height Height of the button in text lines (for textual buttons) or pixels (for images). |
9 | highlightcolor The color of the focus highlight when the widget has focus. |
10 | image Image to be displayed on the button (instead of text). |
11 | justify How to show multiple text lines: LEFT to left-justify each line; CENTER to center them; or RIGHT to right-justify. |
12 | padx Additional padding left and right of the text. |
13 | pady Additional padding above and below the text. |
14 | relief Relief specifies the type of the border. Some of the values are SUNKEN, RAISED, GROOVE, and RIDGE. |
15 | state Set this option to DISABLED to gray out the button and make it unresponsive. Has the value ACTIVE when the mouse is over it. Default is NORMAL. |
16 | underline Default is -1, meaning that no character of the text on the button will be underlined. If nonnegative, the corresponding text character will be underlined. |
17 | width Width of the button in letters (if displaying text) or pixels (if displaying an image). |
18 | wraplength If this value is set to a positive number, the text lines will be wrapped to fit within this length. |
Methods
Following are commonly used methods for this widget −
Sr.No. | Medthod & Description |
---|---|
1 | flash() Causes the button to flash several times between active and normal colors. Leaves the button in the state it was in originally. Ignored if the button is disabled. |
2 | invoke() Calls the button's callback, and returns what that function returns. Has no effect if the button is disabled or there is no callback. |
Example
Try the following example yourself −
# !/usr/bin/python3 from tkinter import * from tkinter import messagebox top = Tk() top.geometry("100x100") def helloCallBack(): msg = messagebox.showinfo( "Hello Python", "Hello World") B = Button(top, text = "Hello", command = helloCallBack) B.place(x = 50,y = 50) top.mainloop()
Result
When the above code is executed, it produces the following result −
