如何在Python中使用条目小部件显示输出？

Question

How can I display an output through Entry Widget. Let say I am adding 2 numbers and wanted to display their sum in a textbox using entry widget.

from tkinter import *
from tkinter.messagebox import *

def show_answer():
    Ans = int(num1.get()) + int(num2.get())
    ans.set(Ans)
    Entry(main,  text = "%s" %(ans) ).grid(row=2, column=1)


main = Tk()
Label(main, text = "Enter Num 1:").grid(row=0)
Label(main, text = "Enter Num 2:").grid(row=1)
Label(main, text = "The Sum is:").grid(row=2)


num1 = Entry(main)
num2 = Entry(main)
blank = Entry(main)


num1.grid(row=0, column=1)
num2.grid(row=1, column=1)
blank.grid(row=2, column=1)


Button(main, text='Quit', command=main.quit).grid(row=4, column=0, sticky=W, pady=4)
Button(main, text='Show', command=show_answer).grid(row=4, column=1, sticky=W, pady=4)

mainloop()

Example output:

Answer 1

If you want to display the answer in your window you could do so by first creating a lable. Then you could change the dispayed text in that lable to what you want it to show.

Creating the lable:

lsum = Tk.Label(master, text = 'The sum is:')
lsum.grid(row=5, column=1, sticky=W, pady=4)

And then updating it:

lsum["text"] = "The sum is: " + str(ans)

Implenting it in your code:

from tkinter import *

from tkinter.messagebox import *

def show_answer():
    Ans = int(num1.get()) + int(num2.get())
    ans.set(Ans)

    lsum["text"] = "The sum is: " + str(ans)
    Entry(main,  text = "%s" %(ans) ).grid(row=2, column=1)


main = Tk() Label(main, text = "Enter Num 1:").grid(row=0) Label(main, text = "Enter Num 2:").grid(row=1) Label(main, text = "The Sum is:").grid(row=2)


num1 = Entry(main) num2 = Entry(main) blank = Entry(main)


num1.grid(row=0, column=1) num2.grid(row=1, column=1) blank.grid(row=2, column=1)


Button(main, text='Quit', command=main.quit).grid(row=4, column=0, sticky=W, pady=4) Button(main, text='Show', command=show_answer).grid(row=4, column=1, sticky=W, pady=4)

lsum = Tk.Label(master, text = 'The sum is:')
lsum.grid(row=5, column=1, sticky=W, pady=4)

mainloop()

Answer 2

I already have the answer

    from tkinter import *
from tkinter.messagebox import *

def show_answer():
    Ans = int(num1.get()) + int(num2.get())
    blank.insert(0, Ans)


main = Tk()
Label(main, text = "Enter Num 1:").grid(row=0)
Label(main, text = "Enter Num 2:").grid(row=1)
Label(main, text = "The Sum is:").grid(row=2)


num1 = Entry(main)
num2 = Entry(main)
blank = Entry(main)


num1.grid(row=0, column=1)
num2.grid(row=1, column=1)
blank.grid(row=2, column=1)


Button(main, text='Quit', command=main.destroy).grid(row=4, column=0, sticky=W, pady=4)
Button(main, text='Show', command=show_answer).grid(row=4, column=1, sticky=W, pady=4)

mainloop()

Answer 3

from tkinter import *
from math import *
main = Tk()
main.title('CALCULATOR')
def add():
    blank.delete(0, END)
    Ans = int(num1.get()) + int(num2.get())
    blank.insert(0, Ans)
def sub():
    blank.delete(0, END)
    Ans = int(num1.get()) - int(num2.get())
    blank.insert(0, Ans)
def mult():
    blank.delete(0, END)
    Ans = int(num1.get()) * int(num2.get())
    blank.insert(0, Ans)
def div():
    blank.delete(0, END)
    Ans = int(num1.get()) / int(num2.get())
    blank.insert(0, Ans)
def clear():
    blank.delete(0, END)
    num2.delete(0, END)
    num1.delete(0, END)
def sq():
    blank.delete(0, END)
    Ans = int(num1.get()) * int(num1.get())
    blank.insert(0, Ans)

def sqrtt():
    blank.delete(0, END)
    h = int(num1.get())
    a = sqrt(h)
    Ans = (int(a))
    blank.insert(0, Ans)

main.geometry('500x100')
Label(main, text = "Enter Num 1:").grid(row=0)
Label(main, text = "Enter Num 2:").grid(row=1)
Label(main, text = "The Answer is:").grid(row=2)


num1 = Entry(main)
num2 = Entry(main)
blank = Entry(main)


num1.grid(row=0, column=1)
num2.grid(row=1, column=1)
blank.grid(row=2, column=1)


Button(main, text='Quit', command=main.destroy).grid(row=4, column=0, sticky=W)
Button(main, text='Add', command=add).grid(row=0, column=3, sticky=W,)
Button(main, text='Subtract', command=sub).grid(row=0, column=4, sticky=W)
Button(main, text='Multiply', command=mult).grid(row=0, column=5, sticky=W)
Button(main, text='Divide', command=div).grid(row=0, column=6, sticky=W)
Button(main, text='^2', command=sq).grid(row=0, column=7, sticky=W)
Button(main, text='Sqrt', command=sqrtt).grid(row=0, column=8, sticky=W)
Button(main, text='Clear', command=clear).grid(row=0, column=9, sticky=W)

mainloop()

I was working on something similar and I modified it and went a little overboard with it, it doesn't work with decimals but it works with every other function.

Answer 4

This will work too (user friendly)

from tkinter import *
import tkinter.messagebox

def show_answer():
    Ans = int(num1.get()) + int(num2.get())
    tkinter.messagebox.showinf('answer',Ans)

main = Tk()

Label(main, text="Enter Num 1:").grid(row=0)
Label(main, text="Enter Num 2:").grid(row=1)

num1 = Entry(main)
num2 = Entry(main)

num1.grid(row=0,column=1)
num2.grid(row=1,column=1)

Button(main,text='Quit',command=main.destroy).grid(row=4,column=0,sticky=W,pady=4)
Button(main,text='Show',command=show_answer).grid(row=4,column=1,sticky=W,pady=4)

mainloop()