如何在 for x in range 循环中获取列表项以显示在 tkinter 框架上

Question

这是原始代码的一部分。我没有收到任何错误消息，但当我打开日历框架时似乎没有显示任何内容。我让 submit(self) 函数在 python 中打印出 Control.counter 的值，当它被调用时，当 Control.counter 值大于 0 时没有任何显示。

class Setup_Info(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent, background="white")

        scrollbar = tk.Scrollbar(self)
        scrollbar.pack(side='right', fill='y')
        title2 = tk.Label(self, text="Setup Information", font=LARGE_FONT, background="white")
        title2.place(relx=0.25, y=0.00, relheight=0.2, relwidth=0.5)

        self.number = tk.Entry(self)
        self.number.place(relx=0.2, y=140, relheight=0.05)

        question1 = tk.Label(self, text="Name of medication:", font=FONT, background="white")
        question1.place(relx=0.2, y=200, relheight=0.05)
        self.entry1 = tk.Entry(self)
        self.entry1.place(relx=0.2, y=240, relheight=0.05, relwidth=0.2)

        question2 = tk.Label(self, text="When it was prescribed:", font=FONT, background="white")
        question2.place(relx=0.2, y=300, relheight=0.05)
        self.entry2 = tk.Entry(self)
        self.entry2.place(relx=0.2, y=340, relheight=0.05, relwidth=0.2)

        question3 = tk.Label(self, text="When you stop the medication:", font=FONT, background="white")
        question3.place(relx=0.2, y=400, relheight=0.05)
        self.entry3 = tk.Entry(self)
        self.entry3.place(relx=0.2, y=440, relheight=0.05, relwidth=0.2)

        question4 = tk.Label(self, text="How many times in a day do you take it:", font=FONT, background="white")
        question4.place(relx=0.2, y=500, relheight=0.05)
        self.entry4 = ttk.Combobox(self)
        self.entry4.config(values = ('1','2','3'))
        self.entry4.place(relx=0.45, y=540, relheight=0.05, relwidth=0.2)

        enter = tk.Button(self, text="Enter", font=LARGE_FONT, background="white",
                          command=self.submit)
        enter.place(relx=0.45, rely=0.2, relheight=0.05, relwidth=0.2)

        enter2 = tk.Button(self, text="Enter", font=LARGE_FONT, background="white",
                          command=lambda: controller.show_frame(Calendar))
        enter2.pack()

        Setup_Info.list1=[]
        Setup_Info.list2=[]
        Setup_Info.list3=[]
        Setup_Info.list4=[]

    def submit(self):
        print(self.number.get())
        Control.counter += int(self.number.get())
        print(Control.counter)
        entry1=self.entry1.get()
        entry2=self.entry2.get()
        entry3=self.entry3.get()
        entry4=self.entry4.get()
        Setup_Info.list1.append(entry1)
        Setup_Info.list2.append(entry2)
        Setup_Info.list3.append(entry3)
        Setup_Info.list4.append(entry4)
        print(Setup_Info.list1)
        print(Setup_Info.list2)
        print(Setup_Info.list3)
        print(Setup_Info.list4)



class Calendar(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent, background="white")

        if Control.counter > 0:
            display_info()

    def display_info():
        for x in range(Control.counter):
            self.medicine1 = tk.Label(self, text=(Setup_Info.list1[x]), font=LARGE_FONT, bg="white")
            self.medicine1.pack()

            self.medicine2 = tk.Label(self, text=(Setup_Info.list2[x]), font=LARGE_FONT, bg="white")
            self.medicine1.pack()

Answer 1

问题是你的Calendar 类在程序启动时被实例化了。在那个时间点，Control.counter 为零（我假设），因为用户还没有机会输入任何内容。因此，框架是空的。

当你去显示框架时，你没有重新创建框架，或者重新初始化内容，所以窗口是空的。

您将需要修改代码以在需要时按需创建类，或者在显示框架之前直接调用display_info 方法。

Answer 2

对于一个似乎您每次初始化 Setup_info 对象时都在 Setup_info 中创建类变量，很有可能每次创建一个列表时列表都被重置为空，但我无法确定基于您拥有的代码提供，尝试从 init()

中删除它

    Setup_Info.list1=[]
    Setup_Info.list2=[]
    Setup_Info.list3=[]
    Setup_Info.list4=[]

并将它们的定义放在类本身中：

class Setup_Info(tk.Frame):
    list1=[]
    list2=[]
    list3=[]
    list4=[]
    def __init__ ...

您的问题显然与 Control 是什么有关，因此如果没有相应的代码，我也无能为力...