I tried playing with the calculator on tkinter

First of all

After learning programming with python, my favorite was ** button processing using tkinter **. When I wondered what could do a lot of that button processing, the calculator came out first.

procedure

Window display

final_python.py

from tkinter import *

#Window creation
root = Tk()
#Window size specification
root.geometry("500x500")
#Window title creation
root.title("Four arithmetic operations")
#Cliche
root.mainloop()

C and AC features

final_python.py

#C function
def clear():
    textVal = expression.get()
    
    if len(textVal) > 1:
        expression.set(textVal[:-1])
    
    else:
        expression.set("")

#AC function
def all_clear():
    expression.set("")

--Role of C and AC

Button layout

final_python.py

buttons = (
    (("C", clear   ), ("AC", all_clear), ("%", op("%") ), ("+", op("+"))),
    (("7", digit(7)), ("8",  digit(8) ), ("9", digit(9)), ("/", op("/"))),
    (("4", digit(4)), ("5",  digit(5) ), ("6", digit(6)), ("*", op("*"))),
    (("1", digit(1)), ("2",  digit(2) ), ("3", digit(3)), ("-", op("-"))),
    (("0", digit(1)), (None, None     ), ('.', op('.') ), ("=", calculate)),
)

• It seems that it is much easier to arrange ** array ** than to arrange buttons one by one.

Completed form

apology

Since I was announcing the final task this time, I wanted to explain all the functions, but since each person's time is limited to 2 minutes, I narrowed down the points so that it can be kept within 2 minutes. The source code is pasted at the end, so please take a look at it ...

Source code

final_python.py

# coding:utf-8
from tkinter import *

#Window display
root = Tk()
#Window size specification
root.geometry("500x500")
#Window title creation
root.title("Four arithmetic operations")

expression = StringVar()

#C function
def clear():
    textVal = expression.get()
    
    if len(textVal) > 1:
        expression.set(textVal[:-1])
    
    else:
        expression.set("")

#AC function
def all_clear():
    expression.set("")

#Number button
def digit(number):
    def func():
        expression.set(expression.get() + str(number))
    return func

#Calculate button
def op(label):
    def func():
        expression.set(expression.get() + label)
    return func

#=Function of
def calculate():
    try:
        expression.set(eval(expression.get()))
    except SyntaxError:
        expression.set("SyntaxError")
    except ZeroDivisionError:
        expression.set("ZeroDivisionError")
    except NameError:
        expression.set("NameError")

buttons = (
    (("C", clear   ), ("AC", all_clear), ("%", op("%") ), ("+", op("+"))),
    (("7", digit(7)), ("8",  digit(8) ), ("9", digit(9)), ("/", op("/"))),
    (("4", digit(4)), ("5",  digit(5) ), ("6", digit(6)), ("*", op("*"))),
    (("1", digit(1)), ("2",  digit(2) ), ("3", digit(3)), ("-", op("-"))),
    (("0", digit(1)), (None, None     ), ('.', op('.') ), ("=", calculate)),
)

#Display screen
e = Label(root, textvariable=expression, fg="#ffffff", bg="#000000", anchor=E, height=2)
e.grid(row=0, column=0, columnspan=4, sticky="EW")

for row, btns in enumerate(buttons, 1):
    for col, (label, func) in enumerate(btns):
        if label:
            b = Button(root, text=label, command=func, width=10, height=5)
            b.grid(row=row, column=col)

#Cliche
root.mainloop()

Impressions

Almost almost the source code was based on Calculator made with Tkinter, but the width of the window, the size of the calculator itself, and the function of C There were some areas that needed to be improved, so I'm glad that I could do it myself. It was also good to be able to understand the meaning of each command. I want to focus on programming during the summer vacation.

References

--The easiest python introductory class Fumitaka Osawa [Author]

-Calculator made with Tkinter