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7. Graphical User Interfaces > Customizing Widgets with Classes
You don’t have to use OOP in tkinter scripts, but it can definitely help. As we just saw, tkinter GUIs are built up as class-instance object trees. Here’s another way Python’s OOP features can be applied to GUI models: specializing widgets by inheritance. Example 7-18 builds the window in Figure 7-19.
Example 7-18. PP4E\Gui\Intro\gui5.py
from tkinter import *
class HelloButton(Button):
def __init__(self, parent=None, **config): # add callback method
Button.__init__(self, parent, **config) # and pack myself
self.pack() # could config style too
self.config(command=self.callback)
def callback(self): # default press action
print('Goodbye world...') # replace in subclasses
self.quit()
if __name__ == '__main__':
HelloButton(text='Hello subclass world').mainloop()
