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dataflair-python-calculator.py
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dataflair-python-calculator.py
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#Importing the necessary modules
from tkinter import *
import parser
from math import factorial
root = Tk()
root.title('sirajtechsolution - Calculator')
#It keeps the track of current position on the input text field
i = 0
# Receives the digit as parameter and display it on the input field
def get_variables(num):
global i
display.insert(i,num)
i+=1
# Calculate function scans the string to evaluates and display it
def calculate():
entire_string = display.get()
try:
a = parser.expr(entire_string).compile()
result = eval(a)
clear_all()
display.insert(0,result)
except Exception:
clear_all()
display.insert(0,"Error")
# Function which takes operator as input and displays it on the input field
def get_operation(operator):
global i
length = len(operator)
display.insert(i,operator)
i+=length
#Function to clear the input field
def clear_all():
display.delete(0,END)
#Function which works like backspace
def undo():
entire_string = display.get()
if len(entire_string):
new_string = entire_string[:-1]
clear_all()
display.insert(0,new_string)
else:
clear_all()
display.insert(0,"Error")
#Function to calculate the factorial and display it
def fact():
entire_string = display.get()
try:
result = factorial(int(entire_string))
clear_all()
display.insert(0,result)
except Exception:
clear_all()
display.insert(0,"Error")
#--------------------------------------UI Design ---------------------------------------------
#adding the input field
display = Entry(root)
display.grid(row=1,columnspan=6,sticky=N+E+W+S)
#Code to add buttons to the Calculator
Button(root,text="1",command = lambda :get_variables(1)).grid(row=2,column=0, sticky=N+S+E+W)
Button(root,text=" 2",command = lambda :get_variables(2)).grid(row=2,column=1, sticky=N+S+E+W)
Button(root,text=" 3",command = lambda :get_variables(3)).grid(row=2,column=2, sticky=N+S+E+W)
Button(root,text="4",command = lambda :get_variables(4)).grid(row=3,column=0, sticky=N+S+E+W)
Button(root,text=" 5",command = lambda :get_variables(5)).grid(row=3,column=1, sticky=N+S+E+W)
Button(root,text=" 6",command = lambda :get_variables(6)).grid(row=3,column=2, sticky=N+S+E+W)
Button(root,text="7",command = lambda :get_variables(7)).grid(row=4,column=0, sticky=N+S+E+W)
Button(root,text=" 8",command = lambda :get_variables(8)).grid(row=4,column=1, sticky=N+S+E+W)
Button(root,text=" 9",command = lambda :get_variables(9)).grid(row=4,column=2, sticky=N+S+E+W)
#adding other buttons to the calculator
Button(root,text="AC",command=lambda :clear_all()).grid(row=5,column=0, sticky=N+S+E+W)
Button(root,text=" 0",command = lambda :get_variables(0)).grid(row=5,column=1, sticky=N+S+E+W)
Button(root,text=" .",command=lambda :get_variables(".")).grid(row=5, column=2, sticky=N+S+E+W)
Button(root,text="+",command= lambda :get_operation("+")).grid(row=2,column=3, sticky=N+S+E+W)
Button(root,text="-",command= lambda :get_operation("-")).grid(row=3,column=3, sticky=N+S+E+W)
Button(root,text="*",command= lambda :get_operation("*")).grid(row=4,column=3, sticky=N+S+E+W)
Button(root,text="/",command= lambda :get_operation("/")).grid(row=5,column=3, sticky=N+S+E+W)
# adding new operations
Button(root,text="pi",command= lambda :get_operation("*3.14")).grid(row=2,column=4, sticky=N+S+E+W)
Button(root,text="%",command= lambda :get_operation("%")).grid(row=3,column=4, sticky=N+S+E+W)
Button(root,text="(",command= lambda :get_operation("(")).grid(row=4,column=4, sticky=N+S+E+W)
Button(root,text="exp",command= lambda :get_operation("**")).grid(row=5,column=4, sticky=N+S+E+W)
Button(root,text="<-",command= lambda :undo()).grid(row=2,column=5, sticky=N+S+E+W)
Button(root,text="x!", command= lambda: fact()).grid(row=3,column=5, sticky=N+S+E+W)
Button(root,text=")",command= lambda :get_operation(")")).grid(row=4,column=5, sticky=N+S+E+W)
Button(root,text="^2",command= lambda :get_operation("**2")).grid(row=5,column=5, sticky=N+S+E+W)
Button(root,text="^2",command= lambda :get_operation("**2")).grid(row=5,column=5, sticky=N+S+E+W)
Button(root,text="=",command= lambda :calculate()).grid(columnspan=6, sticky=N+S+E+W)
root.mainloop()