我正在尝试做一个简单的Python GUI计算器。现在一切都很好。 Entry小部件获取我的输入，但是我不知道如何添加，减去，乘以时间等来获取最终输出。例如，我单击“ 1” +“ 2” =“ 3”。当我单击“ =”时，答案将在输入小部件中给我3。我可以知道如何进行吗？
示例代码：
import sys
from tkinter import *
from PIL import Image, ImageTk
def clear():
txtDisplay.delete(0,END);
return;
#Parent Window.
root = Tk();
root.title('Calculator ++ [1.7.2]');
root.geometry('350x450');
#Main entry.
num1 = StringVar();
txtDisplay = Entry(root, textvariable = num1, relief=RIDGE, bd = 10, width=33, insertwidth = 1, font = 40);
txtDisplay.place(x=15, y=10);
txtDisplay.focus();
def update_entry(v):
current_value = num1.get()
num1.set(current_value + v)
#Buttons:
zeroButton = Button(root, text='0', width=20, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('0')).place(x=17,y=382);
oneButton = Button(root, text='1', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('1')).place(x=17, y=302);
twoButton = Button(root, text='2', width=8, height=3, bg='LightGreen',fg='brown', command = lambda: update_entry('2')).place(x=100, y=302);
threeButton = Button(root, text='3', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('3')).place(x=182, y=302);
fourButton = Button(root, text='4', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('4')).place(x=17, y=222);
fiveButton = Button(root, text='5', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('5')).place(x=100, y=222);
sixButton = Button(root, text='6', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('6')).place(x=182, y=222);
sevenButton = Button(root, text='7', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('7')).place(x=17, y=142);
eightButton = Button(root, text='8', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('8')).place(x=100, y=142);
ninthButton = Button(root, text='9', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('9')).place(x=182, y=142);
decimalButton = Button(root, text='.', width=8, height=3, bg='LightBlue', command = lambda: update_entry('.')).place(x=182, y=382);
equalButton = Button(root, text='=', width=8, height=8, bg='Green', command = lambda: update_entry('=')).place(x=264, y=307);
plusButton = Button(root, text='+', width=8, height=3, bg='gray', command = lambda: update_entry('+')).place(x=264, y=222);
minusButton = Button(root, text='-', width=8, height=3, bg='gray', command = lambda: update_entry('-')).place(x=264, y=142);
multiplyButton = Button(root, text='x', width=8, height=3, bg='gray', command = lambda: update_entry('x')).place(x=264, y=66);
divideButton = Button(root, text='÷', width=8, height=3, bg='gray', command = lambda: update_entry('÷')).place(x=182, y=66);
clearButton = Button(root, text='Clear (CE)', width=20, height=3, command = clear, bg='Blue',fg="Pink").place(x=17, y=66);
#Locks the parent windows size.
root.maxsize(350,450);
root.minsize(350,450);
#Parent window's background color:
root.configure(background = 'black');
root.mainloop();
答案 0 :(得分：0)
也许您可以那样做：
import sys
from tkinter import *
from PIL import Image, ImageTk
def clear():
txtDisplay.delete(0,END);
return;
#Parent Window.
root = Tk();
root.title('Calculator ++ [1.7.2]');
root.geometry('350x450');
#Main entry.
num1 = StringVar();
txtDisplay = Entry(root, textvariable = num1, relief=RIDGE, bd = 10, width=33, insertwidth = 1, font = 40);
txtDisplay.place(x=15, y=10);
txtDisplay.focus();
def update_entry(v):
current_value = num1.get()
num1.set(current_value + v)
def equalOper():
current_num = num1.get()
support_oper = ['+', '-', 'x', '÷']
result = ""
for oper in support_oper:
if oper in current_num:
nums = current_num.split(oper)
if oper == '+':
result = str(float(nums[0]) + float(nums[1]))
if oper == '-':
result = str(float(nums[0]) - float(nums[1]))
if oper == 'x':
result = str(float(nums[0]) * float(nums[1]))
if oper == '÷':
result = str(float(nums[0]) / float(nums[1]))
num1.set(result)
#Buttons:
zeroButton = Button(root, text='0', width=20, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('0')).place(x=17,y=382);
oneButton = Button(root, text='1', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('1')).place(x=17, y=302);
twoButton = Button(root, text='2', width=8, height=3, bg='LightGreen',fg='brown', command = lambda: update_entry('2')).place(x=100, y=302);
threeButton = Button(root, text='3', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('3')).place(x=182, y=302);
fourButton = Button(root, text='4', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('4')).place(x=17, y=222);
fiveButton = Button(root, text='5', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('5')).place(x=100, y=222);
sixButton = Button(root, text='6', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('6')).place(x=182, y=222);
sevenButton = Button(root, text='7', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('7')).place(x=17, y=142);
eightButton = Button(root, text='8', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('8')).place(x=100, y=142);
ninthButton = Button(root, text='9', width=8, height=3, bg='LightGreen', fg='brown', command = lambda: update_entry('9')).place(x=182, y=142);
decimalButton = Button(root, text='.', width=8, height=3, bg='LightBlue', command = lambda: update_entry('.')).place(x=182, y=382);
equalButton = Button(root, text='=', width=8, height=8, bg='Green', command = lambda: equalOper()).place(x=264, y=307);
plusButton = Button(root, text='+', width=8, height=3, bg='gray', command = lambda: update_entry('+')).place(x=264, y=222);
minusButton = Button(root, text='-', width=8, height=3, bg='gray', command = lambda: update_entry('-')).place(x=264, y=142);
multiplyButton = Button(root, text='x', width=8, height=3, bg='gray', command = lambda: update_entry('x')).place(x=264, y=66);
divideButton = Button(root, text='÷', width=8, height=3, bg='gray', command = lambda: update_entry('÷')).place(x=182, y=66);
clearButton = Button(root, text='Clear (CE)', width=20, height=3, command = clear, bg='Blue',fg="Pink").place(x=17, y=66);
#Locks the parent windows size.
root.maxsize(350,450);
root.minsize(350,450);
#Parent window's background color:
root.configure(background = 'black');
root.mainloop();
唯一的问题是数据准确性。