Pyglet.gui

Simple GUI Calculator using Tkinter

To create a Tkinter :

• Import the module Tkinter.
• Create the main window for the calculator
• Add the number of widgets for the main window
• Now apply event trigger on widgets

Let's create a simple GUI calculator using Tkinter.

# import everything from the tkinter module

from tkinter import *

expression = ""

def press(num):
	global expression
	expression = expression + str(num)
    equation.set(expression)
 
def equalpress():
	try:
		global expression
		total = str(eval(expression))
     	equation.set(total)
    	expression = "”
	except:
		equation.set(" error ")
  	    expression = ""
  	    
def clear():
	global expression
	expression = ""
    equation.set("")
 
if __name__ == "__main__":
	gui = Tk()
 	gui.configure(background="light green")
	gui.title("Calculator")
	gui.geometry("270x150")
 	equation = StringVar()    
	expression_field = Entry(gui, textvariable=equation)
  	expression_field.grid(columnspan=4, ipadx=70)
  	
	button1 = Button(gui, text=' 1 ', fg='black', bg='red',
                    command=lambda: press(1), height=1, width=7)
                    
  	button1.grid(row=2, column=0)
  	
 	button2 = Button(gui, text=' 2 ', fg='black', bg='red',
                    command=lambda: press(2), height=1, width=7)
                       
	button2.grid(row=2, column=1)
 
    button3 = Button(gui, text=' 3 ', fg='black', bg='red',
                    command=lambda: press(3), height=1, width=7)
                    
	button3.grid(row=2, column=2)
	
 	button4 = Button(gui, text=' 4 ', fg='black', bg='red',
                    command=lambda: press(4), height=1, width=7)
                    
  	button4.grid(row=3, column=0)
  	
   	button5 = Button(gui, text=' 5 ', fg='black', bg='red',
                    command=lambda: press(5), height=1, width=7)
                    
	button5.grid(row=3, column=1)
	
	button6 = Button(gui, text=' 6 ', fg='black', bg='red',
                    command=lambda: press(6), height=1, width=7)
                    
  	button6.grid(row=3, column=2)
  	
   	button7 = Button(gui, text=' 7 ', fg='black', bg='red',
                    command=lambda: press(7), height=1, width=7)
                    
	button7.grid(row=4, column=0)
	
  	button8 = Button(gui, text=' 8 ', fg='black', bg='red',
                    command=lambda: press(8), height=1, width=7)
                    
   	button8.grid(row=4, column=1)
   	
 	button9 = Button(gui, text=' 9 ', fg='black', bg='red',
                    command=lambda: press(9), height=1, width=7)
                    
	button9.grid(row=4, column=2)
	
	button0 = Button(gui, text=' 0 ', fg='black', bg='red',
                    command=lambda: press(0), height=1, width=7)
                    
  	button0.grid(row=5, column=0)
  	
 	plus = Button(gui, text=' + ', fg='black', bg='red',
                command=lambda: press("+"), height=1, width=7)
                
  	plus.grid(row=2, column=3)
  	
 	minus = Button(gui, text=' - ', fg='black', bg='red',
                command=lambda: press("-"), height=1, width=7)
                
 	minus.grid(row=3, column=3)
 	
	multiply = Button(gui, text=' * ', fg='black', bg='red',
                    command=lambda: press("*"), height=1, width=7)
                    
  	multiply.grid(row=4, column=3)
  	
	divide = Button(gui, text=' / ', fg='black', bg='red',
                    command=lambda: press("/"), height=1, width=7)
                    
	divide.grid(row=5, column=3)
	
	equal = Button(gui, text=' = ', fg='black', bg='red',
                command=equalpress, height=1, width=7)
                
	equal.grid(row=5, column=2)
	
	clear = Button(gui, text='Clear', fg='black', bg='red',
                command=clear, height=1, width=7)
                
	clear.grid(row=5, column='1')
	Decimal= Button(gui, text='.', fg='black', bg='red',
	command=lambda: press('.'), height=1, width=7)
	Decimal.grid(row=6, column=0)
	gui.mainloop()

You can also try this code with Online Python Compiler

Run Code

Output:

Source

We created a simple main window with different widgets for the calculator the above. Using conditions, we can add different colors to widgets; using rows and columns, we create the calculator and add the numbers to it. Not only numbers but also we can add clear buttons and different types of symbols like Arithmetic operators. We can add our background colors by using configuration. We add color, text, height, and width for every button.

FAQs

What is a pyglet?

Pyglet is a library provided by python to develop games, cross-platform windowing, and multimedia. Pyglet supports user interface event handling, windowing, game controllers, graphics, loading images, videos, etc. It can be imported and works on various operating systems like Windows, OS X, and Linux. 

Why is pyglet used?

Pyglet is used to build games and other visual applications. It provides classes and submodules that can style the documents, text files, HTML files, etc. It provides font, size, layout, position, etc., for the content.

What is pyglet.gui?

Pyglet.gui is an extension mainly used for graphical user interface and visually rich applications in python. It provides unique APIs to define custom themes, graphics, and user interfaces.

What is Tkinter ?

Tkinter module is mainly used in GUI applications. It is a standard python interface and an in-built module. Tkinter is the fastest and easiest module that helps us to create GUI applications.

What is the difference between Django and Tkinter?

Django explains web frameworks and helps us to build websites and web apps. Coming to Tkinter is a module used in python where we can create the user forms.

Key Takeaways

We have discussed the concept of the pyglet and the module pyglet.gui in python in this article. 

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