Title : Calculator In Python
Description :
Here we are going to write a python lines to build a calculator in python.
Source Code :
----------------------------------------------Code Starting----------------------------------------------------------
"""
Developer: MuraliDharan
Company: MDCodings
Licence: Copyright @ MDCodings
"""
from tkinter import *
def love():
class Calculator:
def __init__(self, master):
self.master = master
master.title("Python Calculator")
master.configure(bg='#cb464e')
# create screen widget
self.screen = Text(master, state='disabled', width=60, height=3,background="#fcfcec", foreground="#cb464e",font=("times",12,"bold"))
# position screen in window
self.screen.grid(row=0,column=0,columnspan=4,padx=5,pady=5)
self.screen.configure(state='normal')
# initialize screen value as empty
self.equation = ''
# create buttons using method createButton
b1 = self.createButton(7)
b2 = self.createButton(8)
b3 = self.createButton(9)
b4 = self.createButton(u"\u232B",None)
b5 = self.createButton(4)
b6 = self.createButton(5)
b7 = self.createButton(6)
b8 = self.createButton(u"\u00F7")
b9 = self.createButton(1)
b10 = self.createButton(2)
b11 = self.createButton(3)
b12 = self.createButton('*')
b13 = self.createButton('.')
b14 = self.createButton(0)
b15 = self.createButton('+')
b16 = self.createButton('-')
b17 = self.createButton('=',None,34)
# buttons stored in list
buttons = [b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17]
# intialize counter
count = 0
# arrange buttons with grid manager
for row in range(1,5):
for column in range(4):
buttons[count].grid(row=row,column=column)
count += 1
# arrange last button '=' at the bottom
buttons[16].grid(row=5,column=0,columnspan=4)
def createButton(self,val,write=True,width=7):
# this function creates a button, and takes one compulsory argument, the value that should be on the button
return Button(self.master, text=val,command = lambda: self.click(val,write), width=width,background="#4b7fa4",foreground="#fcfcec",font=("times", 20))
def click(self,text,write):
# this function handles what happens when you click a button
# 'write' argument if True means the value 'val' should be written on screen, if None, should not be written on screen
if write == None:
#only evaluate code when there is an equation to be evaluated
if text == '=' and self.equation:
# replace the unicode value of division ./.with python division symbol / using regex
self.equation= re.sub(u"\u00F7", '/', self.equation)
print(self.equation)
answer = str(eval(self.equation))
self.clear_screen()
self.insert_screen(answer,newline=True)
elif text == u"\u232B":
self.clear_screen()
else:
# add text to screen
self.insert_screen(text)
def clear_screen(self):
#to clear screen
#set equation to empty before deleting screen
self.equation = ''
self.screen.configure(state='normal')
self.screen.delete('1.0', END)
def insert_screen(self, value,newline=False):
self.screen.configure(state='normal')
self.screen.insert(END,value)
# record every value inserted in screen
self.equation += str(value)
self.screen.configure(state ='disabled')
root = Tk()
my_gui = Calculator(root)
root.mainloop()
love()
