Changing Font Size in Tkinter
Have you ever used Tkinter to create GUI applications in Python and wanted to customize the font size of a Label widget? If so, you’re in the right place.
In this article, we’ll discuss three methods for changing the font size in Tkinter, provide example code, and explain the output you can expect. Method 1: Changing Font Size Using a Tuple
In this method, we’ll use a tuple to specify the font family, size, and style for a Label widget.
Here’s the code:
“`
from tkinter import *
root = Tk()
root.geometry(“200×100”)
myFont = (‘Helvetica’, 12)
lbl = Label(root, text=”Hello World!”, font=myFont)
lbl.pack(pady=20)
root.mainloop()
“`
In the code above, we first create a new window using the Tk() function and set its size to 200×100 pixels. We then define a tuple called myFont with the font family ‘Helvetica’ and a font size of 12.
Finally, we create a new Label widget called lbl with the text “Hello World!” and set its font to myFont using the font parameter. We then pack lbl onto the window and start the mainloop.
When you run the above code, you should see a window with the text “Hello World!” in a font size of 12. You can modify the font size by changing the second element of the myFont tuple.
Method 2: Changing Font Size Using the Font Class
In this method, we’ll use the Font class to create a font object that we can later use with a Label widget. Here’s the code:
“`
from tkinter import *
from tkinter.font import Font
root = Tk()
root.geometry(“200×100”)
myFont = Font(family=’Helvetica’, size=12)
lbl = Label(root, text=”Hello World!”, font=myFont)
lbl.pack(pady=20)
root.mainloop()
“`
In the code above, we first create a new window using the Tk() function and set its size to 200×100 pixels.
We then create a Font object called myFont with the font family ‘Helvetica’ and a font size of 12 using the Font class. Finally, we create a new Label widget called lbl and set its font to myFont using the font parameter.
We then pack lbl onto the window and start the mainloop. When you run the above code, you should see a window with the text “Hello World!” in a font size of 12.
You can modify the font size by changing the size parameter of the Font object. Method 3: Changing Font Size Using a Custom Class
In this method, we’ll create a custom class called MyLabel that inherits from the Label class and provides a way to easily change the font size.
Here’s the code:
“`
from tkinter import *
from tkinter.font import Font
class MyLabel(Label):
def __init__(self, master=None, **kwargs):
font_size = kwargs.pop(‘font_size’, 12)
font = Font(family=’Helvetica’, size=font_size)
kwargs[‘font’] = font
Label.__init__(self, master, **kwargs)
root = Tk()
root.geometry(“200×100”)
lbl = MyLabel(root, text=”Hello World!”, font_size=14)
lbl.pack(pady=20)
root.mainloop()
“`
In the code above, we first create a custom class called MyLabel that inherits from the Label class. We then define a constructor for MyLabel that accepts a font_size argument, pops it from the kwargs dictionary, creates a Font object with the font family ‘Helvetica’ and the specified font size, sets the font parameter of kwargs to the created Font object, and calls the constructor of the Label class with the modified kwargs.
Finally, we create a new window using the Tk() function, create a new MyLabel widget called lbl with the text “Hello World!” and a font size of 14, pack lbl onto the window, and start the mainloop. When you run the above code, you should see a window with the text “Hello World!” in a font size of 14.
You can modify the font size by changing the font_size parameter of the MyLabel widget.
Example Code and Output
Method 1 Output
“`
from tkinter import *
root = Tk()
root.geometry(“200×100”)
myFont = (‘Helvetica’, 12)
lbl = Label(root, text=”Hello World!”, font=myFont)
lbl.pack(pady=20)
root.mainloop()
“`
Output: A window with the text “Hello World!” in a font size of 12.
Method 2 Output
“`
from tkinter import *
from tkinter.font import Font
root = Tk()
root.geometry(“200×100”)
myFont = Font(family=’Helvetica’, size=12)
lbl = Label(root, text=”Hello World!”, font=myFont)
lbl.pack(pady=20)
root.mainloop()
“`
Output: A window with the text “Hello World!” in a font size of 12.
Method 3 Output
“`
from tkinter import *
from tkinter.font import Font
class MyLabel(Label):
def __init__(self, master=None, **kwargs):
font_size = kwargs.pop(‘font_size’, 12)
font = Font(family=’Helvetica’, size=font_size)
kwargs[‘font’] = font
Label.__init__(self, master, **kwargs)
root = Tk()
root.geometry(“200×100”)
lbl = MyLabel(root, text=”Hello World!”, font_size=14)
lbl.pack(pady=20)
root.mainloop()
“`
Output: A window with the text “Hello World!” in a font size of 14.
Conclusion
In conclusion, we’ve discussed three methods for changing the font size in Tkinter. Method 1 involves using a tuple to specify the font family, size, and style for a Label widget.
Method 2 involves using the Font class to create a font object that we can later use with a Label widget. Method 3 involves creating a custom class that inherits from the Label class and provides a way to easily change the font size.
We’ve also provided example code and explained the output you can expect. With this knowledge, you can now customize the font size of your Tkinter applications to your liking.
Summary
In this article, we discussed various methods for changing the font size in Tkinter. Tkinter is a popular GUI toolkit for Python that allows developers to create desktop applications with ease.
Changing the font size in Tkinter can help to improve the readability of text-based UI elements. We explored three different methods to achieve this, which are:
1.
Changing font size using a tuple
2. Changing font size using Font class
3.
Changing font size using a custom class. In the following section, we will elaborate on these methods and show how they can be used in more detail.
Method 1: Changing Font Size Using a Tuple
In this method, we use a tuple to specify the font family, size, and style for a Label widget. The font parameter in Tkinter Label widget takes a tuple of three attributes, (font_family, font_size, and font_style).
The syntax for setting up the font size using a tuple is as follows:
“`
from tkinter import *
root = Tk()
root.geometry(“200×100”)
myFont = (‘Helvetica’, 12)
lbl = Label(root, text=”Hello World!”, font=myFont)
lbl.pack(pady=20)
root.mainloop()
“`
Here we specify the “myFont” variable to set the font size and font family. The first attribute is the font-family, here we have taken Helvetica.
The second attribute is the font size, which we have set to 12 in this example. Finally, we create a label widget with the “text” parameter, which sets the text to display on the label widget as “Hello World!”.
With this, you can create a window with a label widget and a specific font size that you need. Method 2: Changing Font Size Using Font Class
In this method, we use the Font class to create a font object that we can later use with a Label widget.
This method provides more flexibility, as we can change the various attributes of the Font object and reuse it with multiple widgets. The syntax for setting up the font size using the Font class is as follows:
“`
from tkinter import *
from tkinter.font import Font
root = Tk()
root.geometry(“200×100”)
myFont = Font(family=’Helvetica’, size=12)
lbl = Label(root, text=”Hello World!”, font=myFont)
lbl.pack(pady=20)
root.mainloop()
“`
In this code block, we first import the Font class from the tkinter.font module.
Then, we use the Font() function to set the font size and font family. The first attribute in Font() is the font family.
Here we have used “Helvetica” as the font style. The second attribute is the font size, which we have set to 12.
Finally, we create a label widget with the “text” parameter, which sets the text to display on the label widget as “Hello World!”. One of the advantages of this method is that it is easier to customize the Font object based on the requirements of the project.
Method 3: Changing Font Size Using a Custom Class
In this method, we create a custom class called MyLabel that inherits from the Label class. This custom class allows us to easily change the font size of the Label widget by passing an additional parameter to the constructor.
Here is the code to implement the custom class:
“`
from tkinter import *
from tkinter.font import Font
class MyLabel(Label):
def __init__(self, master=None, **kwargs):
font_size = kwargs.pop(‘font_size’, 12)
font = Font(family=’Helvetica’, size=font_size)
kwargs[‘font’] = font
Label.__init__(self, master, **kwargs)
root = Tk()
root.geometry(“200×100”)
lbl = MyLabel(root, text=”Hello World!”, font_size=14)
lbl.pack(pady=20)
root.mainloop()
“`
Here we define a new class called “MyLabel”, which is inherited from Label. In the constructor, we set the font size using the Font class, and the new “font_size” parameter is passed as an argument to the constructor.
We use the pop() function to remove this new parameter from the dictionary before it calls the parent class constructor. Finally, we create a label widget with the “text” parameter, which sets the text to display on the label widget as “Hello World!”.
One benefit of using a custom class is that you can reuse it in multiple projects, and it provides a more modular approach to designing an application.
Conclusion
Tkinter is a great toolkit for creating desktop applications, and changing font size for label widgets is just one of the many customization options. The three methods discussed in this article provide various ways to achieve the same goal and can be chosen based on the requirements of the project.
The first two methods are easier to use and implement, while the third method provides a more modular and reusable solution for adjusting font size. With these methods, developers can create more readable and user-friendly applications by customizing the font style and size to their liking.
In conclusion, customizing font size in Tkinter is an essential aspect of creating user-friendly desktop applications. This tutorial introduced three methods to change label font size using tuples, Font class, and custom classes.
These methods provide different levels of flexibility and ease of use. Using these approaches, you can significantly improve the readability and appearance of text-based UI elements in your applications.
The key takeaway is that by using a customized font size you can improve user experience. Remember to choose the method that best suits your project requirements.
With the knowledge gained from this article, you can now customize the font size of your Tkinter applications with ease.