需要userInput_1更新

Question

我正在制作一个组织钱财的程序，但是用户输入无法更新

我尝试使用get（）和set（），但似乎无法工作。同样，当我运行该程序时，用户输入值会显示一个我什至没有给出的数字。

root = Tk()

lab = Label(root)
lab.pack()

def clock():
    time = datetime.datetime.now().strftime("Time: %H:%M:%S")
    lab.config(text=time)
    #lab['text'] = time
    root.after(1000, clock) # run itself again after 1000 ms

def userInputSaved():
    global userInput_1
    global userInput_2
    global userInput_3
    userInput_1 = userInput_1.get()
    userInput_2 = userInput_2.get()
    userInput_3 = userInput_3.get()

clock()

a = 0
if a >= 0:
    moneyPaid = Label(root, text = 'Please enter the amount of money you 
have made this month')
    moneyPaid.pack()
    userInput_1 = Entry(root)
    userInput_1.pack()
    a = a + 1

if a == 1:
    bills = Label(root, text = 'Please enter the amount of money you need 
to pay bills with')
    bills.pack()
    userInput_2 = Entry(root)
    userInput_2.pack()
    a = a + 1

if a == 2:
    saved = Label(root, text = 'Please enter the amount of money you want 
the save this month')
    saved.pack()
    userInput_3 = Entry(root)
    userInput_3.pack()
    a = a + 1

if a == 3:
    afterBills = Label(root, text = 'This is the amount of money you have 
after paying the bills: $' + str(userInput_1))
    afterBills.pack()

    afterSaved = Label(root, text = 'This is the amount of money you after 
putting back savings: $')
     afterSaved.pack()

    spending = Label(root, text = 'So the amount of money that you are 
able to use anything with is $')
    spending.pack()

root.mainloop()

结果是，当用户输入一个数字时，该数字将在以后存储和使用。