获取上一个条目

Question

我正在尝试制作一个tkinter小部件，它将记住上一个条目。我遇到的问题是，我所做的按钮方法每次按下前一个条目时都会擦除它

from Tkinter import *

class step1():
    def __init__(self):
        pass

    def getTextbook(self):
        temp = str(textbook.get())
        textbook.delete(0, END) 
        x = " "
        x += temp
        print x 

    def equal_button(self):
        print getTextbook(self) 


root = Tk()
root.title("step1")
root.geometry("600x600")
s = step1()

app = Frame(root)
app.grid()
label = Label(app, text = "step1")
label.grid()

textbook = Entry(app, justify=RIGHT)
textbook.grid(row=0, column = 0, columnspan = 3, pady = 5)

textbook2 = Entry(app, justify=RIGHT) 
textbook2.grid(row=1, column = 0, columnspan = 3, pady = 5)

button1 = Button(app, text = "Return", command = lambda: s.getTextbook())
button1.grid() 

button2 = Button(app, text="Equal")
button2.grid()

root.mainloop()

Answer 1

每次将变量X设置为" "时，getTextbook()中的变量X都会被覆盖。改为尝试列表，并在按下按钮时将每个条目附加到列表中：

from Tkinter import *

root = Tk()

textbookList = []

def getTextbook():
    textbookList.append(textbook.get())
    textbook.delete(0,END)
    print textbookList

textbook = Entry(root)
textbook.pack()

btn1 = Button(root, text='Return', command=getTextbook)
btn1.pack()

root.mainloop()