如何在Pythontkinter中使用Stringvar收集字串？

我正在嘗試獲取輸入的資訊，例如成績和注釋。對于成績，我正在使用 OptionMenu，它列印完美，但我的筆記 (biljeska) 不會列印任何東西

代碼示例：

import tkinter as tk
import datetime
dt = datetime.datetime.today()
class OdabirRazreda():
    def __init__(self):
        self.window2 = tk.Tk()
        g=tk.Button(self.window2,command=self.unos)
        g.pack()

        self.ocjena = tk.StringVar()
        self.razred=tk.StringVar()
        self.biljeska=tk.StringVar()
        self.ucenik=tk.StringVar()
        self.window2.mainloop()

    def unos(self):
        self.window2.withdraw()
        self.window4 = tk.Tk()

        lbl_ocjena = tk.Label(self.window4, text="Ocjena")
        self.lbl_biljeska = tk.Label(self.window4, text="Bilje?ka:")


        lbl_ocjena.grid(row=0, column=0, sticky=tk.W, pady=2)
        self.lbl_biljeska.grid(row=1, column=0, sticky=tk.W, pady=2)


        ent_ocjena = tk.OptionMenu(self.window4, self.ocjena, "1", "2", "3","4","5")
        ent_ocjena.grid(row=0, column=1, pady=2, )

        ent_biljeska = tk.Entry(master=self.window4,textvariable=self.biljeska)
        ent_biljeska.grid(row=1, column=1, pady=2)
        btn_unesi = tk.Button(self.window4, text='Unesi',command=self.ispis)
        btn_unesi.grid(row=3, column=1,pady=2)
        self.window4.mainloop()
    def ispis(self):
        print(dt.day,dt.month,self.ocjena.get(),self.biljeska.get())
OdabirRazreda()

uj5u.com熱心網友回復：

在 tkinter 中，mainloop 方法很復雜，我很少使用您的代碼，但輸出沒有得到預期，但是，很少轉換到框架方法，它作業得很好，如果有用的話可以通過幾乎沒有修改的代碼

import tkinter as tk
import datetime

dt = datetime.datetime.today()


class OdabirRazreda():
    def __init__(self):
        self.root = tk.Tk()

        self.window2 = tk.Frame(self.root)
        self.window2.pack()

        g = tk.Button(self.window2, command=self.unos,)
        g.pack()

        self.ocjena = tk.StringVar()
        self.razred = tk.StringVar()
        self.biljeska = tk.StringVar()
        self.ucenik = tk.StringVar()
        self.root.mainloop()

    def unos(self):
        self.window2.pack_forget() # 'can call destroy() also if no use in further'
        self.window4 = tk.Frame()
        self.window4.pack()

        lbl_ocjena = tk.Label(self.window4, text="Ocjena")
        self.lbl_biljeska = tk.Label(self.window4, text="Bilje?ka:")

        lbl_ocjena.grid(row=0, column=0, sticky=tk.W, pady=2)
        self.lbl_biljeska.grid(row=1, column=0, sticky=tk.W, pady=2)

        ent_ocjena = tk.OptionMenu(self.window4, self.ocjena, "1", "2", "3", "4", "5")
        ent_ocjena.grid(row=0, column=1, pady=2, )

        ent_biljeska = tk.Entry(master=self.window4, textvariable=self.biljeska)
        ent_biljeska.grid(row=1, column=1, pady=2)

        btn_unesi = tk.Button(self.window4, text='Unesi', command=self.ispis)
        btn_unesi.grid(row=3, column=1, pady=2)

    def ispis(self):
        print(dt.day, dt.month, self.ocjena.get(), self.biljeska.get())


OdabirRazreda()

剛剛為兩個視窗創建了框架，并且回圈被分配給主視窗作為根...

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