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.
Here is the simple syntax to create this widget
w = Button ( master, option=value, ... )
Sr.No. | Option & Description |
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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 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. |
Following are commonly used methods for this widget -
Sr.No. | Method & Description |
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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. |
Try the following example yourself -
import Tkinter import tkMessageBox top = Tkinter.Tk() def helloCallBack(): tkMessageBox.showinfo( "Hello Python", "Hello World") B = Tkinter.Button(top, text ="Hello", command = helloCallBack) B.pack() top.mainloop()
When the above code is executed, it produces the following result: