Question

我希望它能够将具有不同价格的不同类型添加到一个简单的GUI中，但我不断收到此回调错误我是从前不久的一个简单的计算器复制代码，但不知道有什么不同，stringvar是否有干扰之处？

from tkinter import *

def price():
    num1 = eval(txtFirst())
    first = num1 * 22.75
    num2 = eval(txtSecond())
    second = num2 * 100
    num3 = eval(txtThird())
    third = num3 * 20.50
    num4 = eval(txtFourth())
    fourth = num4 * 90
    num5 = eval(txtFifth())
    fifth = num5 * 25.50
    num6 = eval(txtSixth())
    sixth = num6 * 125.50
    sum = first + second + third + fourth + fifth + sixth
    cost.set("Sum: " + str(sum))


window = Tk()
window.title("Chicken Feed")
window.geometry("500x500")
Label(window, text="Feed\nType:").grid(row=0, column=0)
Label(window, text="Amount:").grid(row=0,column=1)
Label(window, text="Feed\nCost:").grid(row=0, column=2)
Label(window, text="10kg Pellets:").grid(row=1,column=0)
Label(window, text="50kg Pellets:").grid(row=2,column=0)
Label(window, text="10kg Mash:").grid(row=3,column=0)
Label(window, text="50kg Mash:").grid(row=4,column=0)
Label(window, text="10kg Enhanced:").grid(row=5,column=0)
Label(window, text="50kg Pellets:").grid(row=6,column=0)


cost = StringVar()
cost = Entry(window, state='readonly', width=20, textvariable=cost)
cost.grid(row=1, column=2, columnspan=3, padx=20, pady=6)


txtFirst = StringVar()
entFirst = Entry(window, width=5, textvariable=txtFirst)
entFirst.grid(row=1, column=1)

txtSecond = StringVar()
entSecond = Entry(window, width=5, textvariable=txtSecond)
entSecond.grid(row=2, column=1)

txtThird = StringVar()
entThird = Entry(window, width=5, textvariable=txtThird)
entThird.grid(row=3, column=1)

txtFourth = StringVar()
entFourth = Entry(window, width=5, textvariable=txtFourth)
entFourth.grid(row=4, column=1)

txtFifth = StringVar()
entFifth = Entry(window, width=5, textvariable=txtFifth)
entFifth.grid(row=5, column=1)

txtSixth = StringVar()
entSixth = Entry(window, width=5, textvariable=txtSixth)
entSixth.grid(row=6, column=1)

btnAdd = Button(window, text="Calculate", width=3, command=price)
btnAdd.grid(row=2, column=2, padx=20)

window.mainloop()

在输入小部件中输入数字后，我仍然收到错误消息：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Luke\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:\Users\Luke\Desktop\stage2.py", line 4, in price
    num1 = eval(txtFirst())
TypeError: 'StringVar' object is not callable

Answer 1

我认为您想做的是返回txtFirst的值。请勿为此使用eval()。要获取值：

num1 = txtFirst.get()

我收到TypeError“ StringVar对象不可调用”

1 个答案: