Python GUI tkinter Scientific Calculator

Scientific GUI calculator using Tkinter in Python

Here we will learn to build a Scientific GUI (Graphical User Interface) calculator using tkinter module in Python.

Python Tkinter

The tkinter package is the standard Python interface to the Tk GUI toolkit.

With this module we can build Python based GUI applications.

Scientific GUI calculator using Tkinter

Program

import math as m

from tkinter import *

#Creating main window

root = Tk()

# Giving title to the window

root.title("Scientific Calculator")

# Function used to display values on to the screen Entry box

def enter(val):

if display.get() == "Invalid Input":

display.delete(0, END)

display.insert(END, val)

# Function executes when '=' button is pressed

# Evaluates the value and gives out the result

def EVAL():

try:

value = eval(display.get())

except:

value = "Invalid Input"

display.delete(0, END)

display.insert(0, value)

# Display Box

display = Entry(root, width=60, borderwidth=5)

display.grid(row=0, column=0, columnspan=5)

# Buttons

# Sine

sin = Button(root, text="sin", padx=23, pady=5, bg='#c2d6d6', command=lambda: enter("m.sin("))

# cosine

cos = Button(root, text="cos", padx=23, pady=5, bg='#c2d6d6', command=lambda: enter("m.cos("))

# tangent

tan = Button(root, text="tan", padx=23, pady=5, bg='#c2d6d6', command=lambda: enter("m.tan("))

# hyperbolic sine

sinh = Button(root, text="sinh", padx=20, pady=5, bg='#c2d6d6', command=lambda: enter("m.sinh("))

# hyperbolic cosine

cosh = Button(root, text="cosh", padx=20, pady=5, bg='#c2d6d6', command=lambda: enter("m.cosh("))

# hyperbolic tangent

tanh = Button(root, text="tanh", padx=20, pady=5, bg='#c2d6d6', command=lambda: enter("m.tanh("))

# square root

sqrt = Button(root, text="√", padx=25, pady=5, bg='#c2d6d6', command=lambda: enter("m.sqrt("))

e = Button(root, text="e", padx=28, pady=5, bg='#c2d6d6', command=lambda: enter("m.e"))

pi = Button(root, text="π", padx=25, pady=5, bg='#c2d6d6', command=lambda: enter("m.pi"))

expo = Button(root, text="X^", padx=22, pady=5, bg='#c2d6d6', command=lambda: enter("**"))

# factorial

fac = Button(root, text="X!", padx=25, pady=7, bg='#c2d6d6', command=lambda: enter("m.factorial("))

log = Button(root, text="log", padx=23, pady=7, bg='#c2d6d6', command=lambda: enter("m.log("))

log10 = Button(root, text="log10", padx=18, pady=7, bg='#c2d6d6', command=lambda: enter("m.log10("))

# Complex numbers

comp = Button(root, text="complex \n (real, imaginary)", padx=22, pady=0, command=lambda: enter("complex("))

p1 = Button(root, text="(", padx=28, pady=5, command=lambda: enter("("))

p2 = Button(root, text=")", padx=27, pady=5, command=lambda: enter(")"))

n0 = Button(root, text="0", padx=28, pady=5, bg='#66ffff', command=lambda: enter(0))

n1 = Button(root, text="1", padx=28, pady=5, bg='#66ffff', command=lambda: enter(1))

n2 = Button(root, text="2", padx=28, pady=5, bg='#66ffff', command=lambda: enter(2))

n3 = Button(root, text="3", padx=28, pady=5, bg='#66ffff', command=lambda: enter(3))

n4 = Button(root, text="4", padx=28, pady=5, bg='#66ffff', command=lambda: enter(4))

n5 = Button(root, text="5", padx=28, pady=5, bg='#66ffff', command=lambda: enter(5))

n6 = Button(root, text="6", padx=28, pady=5, bg='#66ffff', command=lambda: enter(6))

n7 = Button(root, text="7", padx=28, pady=5, bg='#66ffff', command=lambda: enter(7))

n8 = Button(root, text="8", padx=28, pady=5, bg='#66ffff', command=lambda: enter(8))

n9 = Button(root, text="9", padx=28, pady=5, bg='#66ffff', command=lambda: enter(9))

add = Button(root, text="+", padx=26, pady=5, bg='#66ffff', command=lambda: enter('+'))

sub = Button(root, text="-", padx=28, pady=5, bg='#66ffff', command=lambda: enter('-'))

mul = Button(root, text="*", padx=28, pady=5, bg='#66ffff', command=lambda: enter('*'))

div = Button(root, text="/", padx=28, pady=5, bg='#66ffff', command=lambda: enter('/'))

dot = Button(root, text=".", padx=29, pady=5, bg='#66ffff', command=lambda: enter('.'))

clear = Button(root, text="AC", padx=21, pady=5, bg='#ff8080', command=lambda: display.delete(0, END))

cut = Button(root, text="DEL", padx=20, pady=5, bg='#ffb3b3', command=lambda: display.delete(len(display.get())-1, END))

equal = Button(root, text="=", padx=25, pady=5, bg='#99ff99', command=lambda: EVAL())

#Providing position to the buttons

n7.grid(row=1, column=0)

n8.grid(row=1, column=1)

n9.grid(row=1, column=2)

cut.grid(row=1, column=3)

clear.grid(row=1, column=4)

n4.grid(row=2, column=0)

n5.grid(row=2, column=1)

n6.grid(row=2, column=2)

mul.grid(row=2, column=3)

div.grid(row=2, column=4)

n1.grid(row=3, column=0)

n2.grid(row=3, column=1)

n3.grid(row=3, column=2)

add.grid(row=3, column=3)

sub.grid(row=3, column=4)

n0.grid(row=4, column=0)

dot.grid(row=4, column=1)

e.grid(row=4, column=2)

pi.grid(row=4, column=3)

equal.grid(row=4, column=4)

sin.grid(row=5, column=0)

cos.grid(row=5, column=1)

tan.grid(row=5, column=2)

p1.grid(row=5, column=3)

p2.grid(row=5, column=4)

sinh.grid(row=6, column=0)

cosh.grid(row=6, column=1)

tanh.grid(row=6, column=2)

sqrt.grid(row=6, column=3)

expo.grid(row=6, column=4)

fac.grid(row=7, column=0)

log.grid(row=7, column=1)

log10.grid(row=7, column=2)

comp.grid(row=7, column=3, columnspan=2)

root.mainloop()

Output

Module and methods used in the program

• tkinter
• Tk()
• title()
• Entry()
• Button()
• math
• math.sin()
• math.cos()
• math.tan()
• math.sinh()
• math.cosh()
• math.tanh()
• math.sqrt()
• math.e
• math.pi
• math.factorial()
• math.log()
• math.log10()