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How do you make a simple calculator in Python?

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YasminRadwan26

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2022-05-15

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How do you make a simple calculator in Python?

In this exercise, you will learn a simple calculator program in Python. By using this, you can develop a simple calculator which displays the different arithmetical operations, i.e., addition, subtraction, multiplication and division.

Tkinter is a standard cross-platform package for creating GUIs. It is also called Tk interface. It is an original GUI library for Tcl (Tool Command Language). Tkinter comes pre-installed with Python. Tkinter is rich in widgets, like radiobutton, checkbutton, menu, frame, canvas and much more. Here, we have used this for developing a simple calculator program.

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YasminRadwan26

2022-05-15

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Simple Calculator Program in Python

from tkinter import * 

def frame(root, side):
    window = Frame(root)
    window.pack(side=side, expand=YES, fill=BOTH)
    return window 

def button(root, side, text, command=None):
    window = Button(root, text=text, command=command, background = 'lightgray')
    window.pack(side=side, expand=YES, fill=BOTH)
    return window 

class SimpleCalculator(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.pack(expand=YES, fill=BOTH)
        self.master.title('Simple Calculator')
        self.master.iconname("calculator")
        self.master.geometry('300x250')
        display = StringVar()
        
        Entry(self, relief=SUNKEN,
            textvariable=display,  background = 'lightyellow').pack(side=TOP, expand=YES,
            fill=BOTH)
        
        for key in ("123", "456", "789", "-0."):
            keyFrame = frame(self, TOP)
            for char in key:
                button(keyFrame, LEFT, char,
                lambda w=display, s=' %s '%char: w.set(w.get()+s))
                
        x = frame(self, TOP)
        for char in "+-*/=":
            if char == '=':
                btn = button(x, LEFT, char)
                btn.bind('',
                    lambda e, s=self, w=display: s.calc(w), '+')
            else:
                btn = button(x, LEFT, char,
                    lambda w=display, c=char: w.set(w.get()+' '+c+' '))
        clearF = frame(self, BOTTOM)
        button(clearF, LEFT, 'Clr', lambda w=display: w.set(''))
        
    def calc(self, display):
        try:
            display.set(eval(display.get()))
        except ValueError:
            display.set("ERROR")
            
if __name__ == '__main__':
    SimpleCalculator().mainloop()

Sample output of the above program -

Simple Calculator Program

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