1. Python tkinter Set a specific or fixed window size

In the use of Python tkinter Set a specific size for the window , Use Tk() Class variable geometry() function .

from tkinter import *
gui = Tk()
gui.geometry("widthxheight")

among ,width and height It should be replaced by integer numbers representing the width and height of the window, respectively . Pay attention to the geometry() Of width and height There is one between the variables x.
Be careful ： Notice the size of the window width x height The title window does not contain the title window .

1.1. Example 1 ： stay Python tkinter Set the window size in

In this example , We will use geometry() The way to give Tk() Window set a fixed 500 ride 200 Size .

from tkinter import *
gui = Tk(className='Python Examples - Window Size')
# set window size
gui.geometry("500x200")
gui.mainloop()

Execution and output ：

You can see , When the change procedure is being implemented , Will open a geometry() Function to define the size of the window GUI window .

1.2. Set window size

Now let's change the offer to geometry() The width and length of the function , such as 300 ride 300.

from tkinter import *
gui = Tk(className='Python Examples - Window Size')
# set window size
gui.geometry("300x300")
gui.mainloop()

Execution and output ：

1.3. Summary

In this section, we will learn how to use the tkinter Of GUI Program setting window size .

2. Python tkinter Button example

2.1. Python tkinter Button

We will use Python Of tkinter Library to implement Python GUI Button in .
Add a button to tkinter The syntax of the window is as follows ：

mybutton = Button(master, option=value)
mybutton.pack()

among master Is for the window you want to add to .tkinter The library provides different options for button constructors to change their appearance .

2.2. Example 1 ： Use tkinter Library button

In the next example , We're going to create one tkinter Button .

from tkinter import *
gui = Tk(className='Python Examples - Button')
gui.geometry("500x200")
# create button
button = Button(gui, text='My Button', width=40, height=3, bg='#0052cc', fg='#ffffff', activebackground='#0052cc', activeforeground='#aaffaa')
# add button to gui window
button.pack()
gui.mainloop()

Execution and output ：

2.3. Summary

In this section, we learned how to use tkinter Library to create a GUI Button .

3. Click the button to call the function

When one tkinter When the button is pressed , You can use command Property to call a function . Assign the function name to which you want the button to be called when it is clicked command Attribute is enough .
Here is the pseudo code for calling a function when the button is clicked ：

def someFunction:
function body
tkWindow = Tk()
button = Button(tkWindow, command=someFunction)

Or you can assign it after defining the button command：

def someFunction:
function body
tkWindow = Tk()
button = Button(tkWindow)
button['command'] = someFunction

3.1. Click the button to call the event function

from tkinter import *
from tkinter import messagebox
tkWindow = Tk()
tkWindow.geometry('400x150')
tkWindow.title('Defonds.net Tkinter Example')
def showMsg():
messagebox.showinfo('Message', 'You clicked the Submit button!')
button = Button(tkWindow, text='Submit', command=showMsg)
button.pack()
tkWindow.mainloop()

Execution and output ：

We need to pay attention when we call the function after we provide the user click button. ：

• Define the function before the button is set
• command The value of the option is the function name without any quotation marks

4. Change font family 、 Font size and format

To change the font properties , Such as font series 、 font size 、 Font thickness, etc , have access to tkinter.font package .
In the program , introduce tkinter.font as font And provide variables to font.Font().

4.1. change tkinter The font series of buttons

In the following example , We will use family Name the parameter to font.Font() To change tkinter The font series of buttons .

from tkinter import *
import tkinter.font as font
gui = Tk(className='Python examples - Button')
gui.geometry('500x200')
# define font
myFont = font.Font(family='Helvetica')
# create button
button = Button(gui, text='My Button', bg='#0052cc', fg='#ffffff')
# apply font to the button label
button['font'] = myFont
# add button to gui window
button.pack()
gui.mainloop()

Execution and output ：

If not provided font, This button will look like this ：

4.2. change tkinter The font size of the button

We can also pass named parameters text to font.Font() To change tkinter The font size of the text in the button .

from tkinter import *
import tkinter.font as font
gui = Tk(className='Python examples - Button')
gui.geometry('500x200')
# define font
myFont = font.Font(size=30)
# create button
button = Button(gui, text='My Button', bg='#0052cc', fg='#ffffff')
# apply font to the button label
button['font'] = myFont
# add button to gui window
button.pack()
gui.mainloop()

Execution and output ：

4.3. change tkinter The font thickness of the button

We can also pass named parameters weight to font.Font() To change tkinter The font thickness of the text in the button .

from tkinter import *
import tkinter.font as font
gui = Tk(className='Python examples - Button')
gui.geometry('500x200')
# define font
myFont = font.Font(weight='bold')
# create button
button = Button(gui, text='My Button', bg='#0052cc', fg='#ffffff')
# apply font to the button label
button['font']=myFont
# add button to gui window
button.pack()
gui.mainloop()

Execution and output ：

4.4. change tkinter The font series of buttons 、 Font size and font thickness .

We can package and pass the above settings to font.Font().

from tkinter import *
import tkinter.font as font
gui = Tk(className='Python examples = Button')
gui.geometry('500x200')
# define font
myFont = font.Font(family='Helvetica', size=20, weight='bold')
# create button
button = Button(gui, text='My Button', bg='#0052cc', fg='#ffffff')
# apply font to the button label
button['font']=myFont
# add button to gui window
button.pack()
gui.mainloop()

Execution and output ：

We changed the font family to Courier Then run the program again ：

myFont = font.Font(family='Courier', size=20, weight='bold')

Execution and output ：

4.5. Summary

In this section , We use detailed examples , Demonstrates how to change tkinter The font series of buttons 、 Font size and font thickness .
Reference material

• Python tkinter Set Specific or Fixed Window Size
• Python Button Example
• Python tkinter – Call a Function on Clicking Button
• Python tkinter Button – Change Font Style