I have a simple calculator code but when i want to start a new calculation after pressing equal the answer from last calculation wont get clear unless i press the clear button (it starts behind the answer), so now i want to make it clear past answer when i start new calculation. Thanks in advance!
from tkinter import *
root = Tk()
root.title("Simple Calculator")
e = Entry(root, width=35, borderwidth=5)
e.grid(row=0, column=0, columnspan=3, padx=10, pady=1)
perhaps i need some kind of boolean here
def button_click(number):
current = e.get()
e.delete(0, END)
e.insert(0, str(current) + str(number))
def button_clear():
e.delete(0, END)
def button_add():
first_number = e.get()
global f_num
f_num = int(first_number)
e.delete(0, END)
def button_equal():
second_number = e.get()
e.delete(0, END)
if math == "addition":
e.delete(0, END)
e.insert(0, f_num + int(second_number))
if math == "subtraction":
e.delete(0, END)
e.insert(0, f_num - int(second_number))
if math == "multiplication":
e.delete(0, END)
e.insert(0, f_num * int(second_number))
if math == "division":
e.delete(0, END)
e.insert(0, f_num / int(second_number))
def button_add():
first_number = e.get()
global f_num
global math
math = "addition"
f_num = int(first_number)
e.delete(0, END)
def button_subtract():
first_number = e.get()
global f_num
global math
math = "subtraction"
f_num = int(first_number)
e.delete(0, END)
def button_multiply():
first_number = e.get()
global f_num
global math
math = "multiplication"
f_num = int(first_number)
e.delete(0, END)
def button_divide():
first_number = e.get()
global f_num
global math
math = "division"
f_num = int(first_number)
e.delete(0, END)
button_1 = Button(root, text="1", padx=40, pady=20, bg="white", command=lambda: button_click(1))
button_2 = Button(root, text="2", padx=40, pady=20, bg="white", command=lambda: button_click(2))
button_3 = Button(root, text="3", padx=40, pady=20, bg="white", command=lambda: button_click(3))
button_4 = Button(root, text="4", padx=40, pady=20, bg="white", command=lambda: button_click(4))
button_5 = Button(root, text="5", padx=40, pady=20, bg="white", command=lambda: button_click(5))
button_6 = Button(root, text="6", padx=40, pady=20, bg="white", command=lambda: button_click(6))
button_7 = Button(root, text="7", padx=40, pady=20, bg="white", command=lambda: button_click(7))
button_8 = Button(root, text="8", padx=40, pady=20, bg="white", command=lambda: button_click(8))
button_9 = Button(root, text="9", padx=40, pady=20, bg="white", command=lambda: button_click(9))
button_0 = Button(root, text="0", padx=40, pady=20, bg="white", command=lambda: button_click(0))
button_equal = Button(root, text="=", padx=90, pady=20, bg="white", command=button_equal)
button_clear = Button(root, text="clear", padx=80, pady=20, bg="white", command=button_clear)
button_add = Button(root, text="+", padx=40, pady=20, bg="white", command=button_add)
button_subtract = Button(root, text="-", padx=40, pady=20, bg="white", command=button_subtract)
button_multiply = Button(root, text="*", padx=40, pady=20, bg="white", command=button_multiply)
button_divide = Button(root, text="/", padx=40, pady=20, bg="white", command=button_divide)
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2)
button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2)
button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2)
button_0.grid(row=4, column=0)
button_clear.grid(row=4, column=1, columnspan=2)
button_add.grid(row=5, column=0)
button_equal.grid(row=5, column=1, columnspan=2)
button_subtract.grid(row=6, column=0)
button_multiply.grid(row=6, column=1)
button_divide.grid(row=6, column=2)
root.mainloop()
One way of doing it is by giving a signal. For example, set equals=False in the beginning, it should become True only if the user presses = button. You must keep checking if the equals become True in the button_click function, if it is True and the next inserted element is a digit then delete all the text in the text box.
Here is a demonstration. You may further improve this if you wish to.
from tkinter import *
import re
def _split(number):
global lst
global operation
lst = re.split(r'[^\w]', number)
lst = [x for x in lst if x!='']
if len(lst)==1:
return None, None
lst = list(map(int, lst))
operation = re.split(r'[\d]', number)
operation = [x for x in operation if x != '']
return lst, operation
def operate(numbers, operation):
if operation == '+':
return numbers[0] + numbers[1]
elif operation == '-':
return numbers[0] - numbers[1]
elif operation == '*':
return numbers[0] * numbers[1]
elif operation == '/':
try:
return numbers[0]/numbers[1]
except:
print('ERROR')
else:
print('Invalid operation')
def button_click(number):
global equals
operand = []
e.insert(END, str(number))
if e.get()[-1:].isdigit() and equals:
e.delete(0, END)
e.insert(END, str(number))
equals = False
operand, operation = _split(e.get())
if operation != None and len(operation)==2:
value = operate(operand, operation[0])
e.delete(0, END)
e.insert(0, f'{value}{operation[1]}')
def button_clear():
e.delete(0, END)
def button_equal():
global equals
number = e.get()
operand, operation = _split(number)
value = number
if operand and operation:
value = operate(operand, operation[0])
equals = True
e.delete(0, END)
e.insert(0, value)
root = Tk()
root.title("Simple Calculator")
e = Entry(root, width=35, borderwidth=5)
e.grid(row=0, column=0, columnspan=3, padx=10, pady=1)
equals = False
operation = None
lst = [0]
button_1 = Button(root, text="1", padx=40, pady=20, bg="white", command=lambda: button_click(1))
button_2 = Button(root, text="2", padx=40, pady=20, bg="white", command=lambda: button_click(2))
button_3 = Button(root, text="3", padx=40, pady=20, bg="white", command=lambda: button_click(3))
button_4 = Button(root, text="4", padx=40, pady=20, bg="white", command=lambda: button_click(4))
button_5 = Button(root, text="5", padx=40, pady=20, bg="white", command=lambda: button_click(5))
button_6 = Button(root, text="6", padx=40, pady=20, bg="white", command=lambda: button_click(6))
button_7 = Button(root, text="7", padx=40, pady=20, bg="white", command=lambda: button_click(7))
button_8 = Button(root, text="8", padx=40, pady=20, bg="white", command=lambda: button_click(8))
button_9 = Button(root, text="9", padx=40, pady=20, bg="white", command=lambda: button_click(9))
button_0 = Button(root, text="0", padx=40, pady=20, bg="white", command=lambda: button_click(0))
button_equal = Button(root, text="=", padx=90, pady=20, bg="white", command=button_equal)
button_clear = Button(root, text="clear", padx=80, pady=20, bg="white", command=button_clear)
button_add = Button(root, text="+", padx=40, pady=20, bg="white", command=lambda :button_click('+'))
button_subtract = Button(root, text="-", padx=40, pady=20, bg="white", command=lambda :button_click('-'))
button_multiply = Button(root, text="*", padx=40, pady=20, bg="white", command=lambda :button_click('*'))
button_divide = Button(root, text="/", padx=40, pady=20, bg="white", command=lambda :button_click('/'))
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2)
button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2)
button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2)
button_0.grid(row=4, column=0)
button_clear.grid(row=4, column=1, columnspan=2)
button_add.grid(row=5, column=0)
button_equal.grid(row=5, column=1, columnspan=2)
button_subtract.grid(row=6, column=0)
button_multiply.grid(row=6, column=1)
button_divide.grid(row=6, column=2)
root.mainloop()
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