python calculator gui

1from tkinter import *
2
3
4def adding():
5    try:
6        text1 = int(Textbox1.get())
7        text2 = int(Textbox2.get())
8    except Exception:
9        Output.delete(0, END)
10        Output.insert(0, 'Error! Enter a number please!')
11        return
12    text_output = str(text1 + text2)
13    Output.delete(0, END)
14    Output.insert(0, text_output)
15
16root = Tk()
17root.title('Adding')
18root.geometry('500x500')
19Textbox1 = Entry(root)
20Textbox1.pack(ipadx=50, ipady=10)
21spacing = Label(root, text='+')
22spacing.pack()
23Textbox2 = Entry(root)
24Textbox2.pack(ipadx=50, ipady=10)
25spacing2 = Label(root)
26spacing2.pack()
27Button1 = Button(root, text='Add The numbers!', command=adding)
28Button1.pack()
29spacing3 = Label(root)
30spacing3.pack()
31Output = Entry(root)
32Output.pack(ipadx=50)
33root.mainloop()
34

1from tkinter import *
2 
3class Calculator:
4    def __init__(self,master):
5        self.master = master
6        master.title("My Calculator @ www.pickupbrain.com")
7        master.configure(bg='#C0C0C0')
8         
9        #creating screen widget
10        self.screen = Text(master, state='disabled', width=50,height= 3, background="#EAFAF1", foreground="#000000",font=("Arial",15,"bold"))
11         
12        #Screen position in window
13        self.screen.grid(row=0,column=0,columnspan=4,padx=2,pady=2)
14        self.screen.configure(state='normal')
15         
16        #initialize screen value as empty
17        self.equation=''
18         
19        #create buttons
20        b1 = self.createButton(7)
21        b2 = self.createButton(8)
22        b3 = self.createButton(9)
23        b4 = self.createButton(u"\u232B",None)
24        b5 = self.createButton(4)
25        b6 = self.createButton(5)
26        b7 = self.createButton(6)
27        b8 = self.createButton(u"\u00F7")
28        b9 = self.createButton(1)
29        b10 = self.createButton(2)
30        b11 = self.createButton(3)
31        b12 = self.createButton('*')
32        b13 = self.createButton('.')
33        b14 = self.createButton(0)
34        b15 = self.createButton('+')
35        b16 = self.createButton('-')
36        b17 = self.createButton('=', None,35)
37         
38        #stored all buttons in list
39        buttons = [b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17]
40         
41        #initalize counter
42        count=0
43         
44        #arrange buttons with grid manager
45        for row in range(1,5):
46            for column in range(4):
47                buttons[count].grid(row = row, column= column,padx=0,pady=0)
48                count +=1
49                 
50                #arrange last button '=' at the bottom
51            buttons[16].grid(row=5,column=0,columnspan=4)
52                 
53    def createButton(self,val,write=True,width=8):
54         
55        #this function creates a button and takes one compulsary argument, the value that should be on the button
56        return Button(self.master,text=val,command= lambda:self.click(val,write),width=width,background="#ffffff",foreground ="#1f4bff",font=("times",20,"bold"))
57                 
58    def click(self,text,write):
59        #this function handles the actions when you
60        #click a button 'write' arguement, if true
61        #than value val should be written on screen,
62        #if none then should not be written on screen
63        if write == None:
64             
65            #Evaluates when there is an equation to be evaluated
66            if text == '=' and self.equation:
67                #replace the unicode values of division ./. with python division
68                #symbol / using regex
69                self.equation = re.sub(u"\u00F7", '/', self.equation)
70                print(self.equation)
71                answer = str(eval(self.equation))
72                self.clear_screen()
73                self.insert_screen(answer,newline = True)
74            elif text == u"\u232B":
75                self.clear_screen()
76             
77        else:
78            #add text to screen
79                self.insert_screen(text)
80                 
81    def clear_screen(self):
82        #to clear screen
83        #set equation to empty before deleteing screen
84        self.equation = ''
85        self.screen.configure(state = 'normal')
86        self.screen.delete('1.0', END)
87                     
88    def insert_screen(self, value, newline = False):
89        self.screen.configure(state ='normal')
90        self.screen.insert(END,value)
91         
92        #record every value inserted in screen
93        self.equation += str(value)
94        self.screen.configure(state = 'disabled')
95                     
96def calci():
97     
98    #Function that creates calculator GUI
99    root = Tk()
100    my_gui = Calculator(root)
101    root.mainloop()
102     
103# Running Calculator    
104calci()                                    
105

1# importing everyting from tkinter
2from tkinter import *
3# expression to access among all the functions
4expression = ""
5# functions
6def input_number(number, equation):
7   # accessing the global expression variable
8   global expression
9   # concatenation of string
10   expression = expression + str(number)
11   equation.set(expression)
12def clear_input_field(equation):
13   global expression
14   expression = ""
15   # setting empty string in the input field
16   equation.set("Enter the expression")
17def evaluate(equation):
18global expression
19# trying to evaluate the expression
20try:
21result = str(eval(expression))
22# showing the result in the input field
23equation.set(result)
24# setting expression to empty string
25expression = ""
26except:
27# some error occured
28# showing it to the user equation.set("Enter a valid expression")
29expression = ""
30# creating the GUI
31def main():
32   # main window window = Tk()
33   # setting the title of GUI window
34   window.title("Calculator")
35   # set the configuration of GUI window
36   window.geometry("325x175")
37   # varible class instantiation
38   equation = StringVar()
39   # input field for the expression
40   input_field = Entry(window, textvariable=equation)
41   input_field.place(height=100)
42   # we are using grid position
43   # for the arrangement of the widgets
44   input_field.grid(columnspan=4, ipadx=100, ipady=5)
45   # settin the placeholder message for users
46   equation.set("Enter the expression")
47   # creating buttons and placing them at respective positions
48   _1 = Button(window, text='1', fg='white', bg='black', bd=0, command=lambda: input_number(1, equation), height=2, width=7)
49   _1.grid(row=2, column=0)
50   _2 = Button(window, text='2', fg='white', bg='black', bd=0, command=lambda: input_number(2, equation), height=2, width=7)
51   _2.grid(row=2, column=1)
52   _3 = Button(window, text='3', fg='white', bg='black', bd=0, command=lambda: input_number(3, equation), height=2, width=7)
53   _3.grid(row=2, column=2)
54   _4 = Button(window, text='4', fg='white', bg='black', bd=0, command=lambda: input_number(4, equation), height=2, width=7)
55   _4.grid(row=3, column=0)
56   _5 = Button(window, text='5', fg='white', bg='black', bd=0, command=lambda: input_number(5, equation), height=2, width=7)
57   _5.grid(row=3, column=1)
58   _6 = Button(window, text='6', fg='white', bg='black', bd=0, command=lambda: input_number(6, equation), height=2, width=7)
59   _6.grid(row=3, column=2)
60   _7 = Button(window, text='7', fg='white', bg='black', bd=0, command=lambda: input_number(7, equation), height=2, width=7)
61   _7.grid(row=4, column=0)
62   _8 = Button(window, text='8', fg='white', bg='black', bd=0, command=lambda: input_number(8, equation), height=2, width=7)
63   _8.grid(row=4, column=1)
64   _9 = Button(window, text='9', fg='white', bg='black', bd=0, command=lambda: input_number(9, equation), height=2, width=7)
65   _9.grid(row=4, column=2)
66   _0 = Button(window, text='0', fg='white', bg='black', bd=0, command=lambda: input_number(0, equation), height=2, width=7)
67   _0.grid(row=5, column=0)
68   plus = Button(window, text='+', fg='white', bg='black', bd=0, command=lambda: input_number('+', equation), height=2, width=7)
69   plus.grid(row=2, column=3)
70   minus = Button(window, text='-', fg='white', bg='black', bd=0, command=lambda: input_number('-', equation), height=2, width=7)
71   minus.grid(row=3, column=3)
72   multiply = Button(window, text='*', fg='white', bg='black', bd=0, command=lambda:  input_number('*', equation), height=2, width=7)
73   multiply.grid(row=4, column=3)
74   divide = Button(window, text='/', fg='white', bg='black', bd=0, command=lambda: input_number('/', equation), height=2, width=7)
75   divide.grid(row=5, column=3)
76   equal = Button(window, text='=', fg='white', bg='black', bd=0, command=lambda: evaluate(equation), height=2, width=7)
77   equal.grid(row=5, column=2)
78   clear = Button(window, text='Clear', fg='white', bg='black', bd=0, command=lambda: clear_input_field(equation), height=2, width=7)
79   clear.grid(row=5, column=1)
80   # showing the GUI
81   window.mainloop()
82# start of the program
83if __name__ == '__main__':
84      main()
85