python - 列表中的 Tkinter Entry 小部件都保存相同的数据

Question

我有一个名为 display_change 的函数，它位于我的 tkinter GUI 中间。我希望用户选择一个数字并创建他们选择的输入框的数量。我想出了如何使用 for 循环来做到这一点，并将每个输入框放入一个列表中。然而，每当我写一些东西时，所有条目小部件之间都会保存相同的数据。

我不想显示我的所有代码，但可以显示发生这种情况的整个函数。

import tkinter as tk
from tkinter.ttk import Frame, Button
labels = []
entries = []

class Application(Frame):
    def __init__(self)
        super().__init__()
        self.mainFrame()

    def mainFrame(self):
        self.master.title("Setup")
        self.pack(fill=tk.BOTH, expand=True)
        self.columnconfigure(1, weight=1)
        self.columnconfigure(3, pad=7)
        self.rowconfigure(3, weight=1)
        self.rowconfigure(5, pad=7)
        lbl = tk.Label(self, text="Follow the instructions on each page", bg="snow2")
        lbl.grid(sticky=tk.W, pady=4, padx=5)

        area = tk.Frame(self, bg="white")
        area.grid(row=1, column=0, columnspan=3, rowspan=4,
              padx=5, sticky=tk.E + tk.W + tk.S + tk.N)

        # ----------Inside White Box ---------------------
        lbl = tk.Label(area, text="Select the number of parts to create:")
        lbl.grid(row=1, column=0)

        choices = {0, 3, 4, 5, 6, 7, 8, 9, 10}

        node_count = tk.IntVar()
        node_count.set(0)
        node_select = tk.OptionMenu(area, node_count, *choices,
                                command=lambda x: self.display_change(area, node_count.get()))
        node_select.grid(row=1, column=2)

        # -----------Outside Part-------------------------
        abtn = Button(self, text="Thing 1")
        abtn.grid(row=1, column=3, sticky=tk.W)
        cbtn = Button(self, text="Thing 2")
        cbtn.grid(row=2, column=3, pady=4, sticky=tk.W)

        abtn2 = Button(self, text="Thing 3")
        abtn2.grid(row=3, column=3, sticky=tk.W + tk.N)

        cbtn2 = Button(self, text="Thing 4")
        cbtn2.grid(row=3, column=3, pady=28, sticky=tk.W + tk.N)

        hbtn = Button(self, text="Exit")
        hbtn.grid(row=5, column=2, sticky=tk.W)

        sbtn = Button(self, text="Save")
        sbtn.grid(row=5, column=3, pady=3, sticky=tk.W)

        sbtn = Button(self, text="Help")
        sbtn.grid(row=5, column=0, sticky=tk.W)

    def display_change(self, area, nodes):
        """Here is where the display is changed so what the user choose is correctly displayed"""

        lower_label = tk.Label(area, text="Enter the value of each part")
        lower_label.grid(row=2, column=0, sticky=tk.N + tk.W)

        global labels, entries
        for label in labels:
            label.destroy()
        for entry in entries:
            entry.destroy()
        labels = []
        entries = []

        # This loop creates the correct number of entry box's and labels. Each entry is stored separately
        for i in range(nodes):
            if nodes <= 4:
                labels.append(tk.Label(area, text="Part "+str(i+1)))
                labels[i].place(x=10+(120*i), y=55)
                entries.append(tk.Entry(area, text="Change"))
                entries[i].place(x=10 + (120 * i), y=80, width=100)
            else:
                labels.append(tk.Label(area, text="part " + str(i + 1)))
                labels[i].place(x=10 + (120 * i), y=105)
                entries.append(tk.Entry(area, text="Change"))
                entries[i].place(x=10 + (120 * i), y=160, width=100)

if __name__ == "__main__":
root = tk.Tk()

"""Calculate center of screen so popup is center"""
w = 650
h = 400

ws = root.winfo_screenwidth()
hs = root.winfo_screenheight()

x = (ws / 2) - (w / 2)
y = (hs / 2) - (h / 2)
root.geometry('%dx%d+%d+%d' % (w, h, x, y))

# This line prevents the user from changing the size of the window
root.resizable(width=False, height=False)

app = Application(root)
root.mainloop()

这就是我输入内容时的样子:

我只输入了一次“abcd”，但它进入了所有条目

Answer 1

当您查看所有可用的config时tkinters 文档中的选项 输入字段 text 不是其中之一。很可能是因为 textvariable 是 Entry 字段的可用参数，tkinter 将 text 视为 textvariable 的缩写。因此，结果是您的所有条目字段都被分配了相同的文本变量，并且当一个条目更改该变量时，所有条目都会使用该变量中的新字符串进行更新。

编写 for 循环的正确方法如下所示:

for i in range(nodes):
    if nodes  <= 4:
        labels.append(tk.Label(area, text="Part {}".format(i+1)))
        labels[i].place(x=10+(120*i), y=55)
        entries.append(tk.Entry(area))
        entries[i].insert(0, "Change Ip") # adds text directly to an entry field
        entries[i].place(x=10 + (120 * i), y=80, width=100)
    else:
        labels.append(tk.Label(area, text="Node {}".format(i+1)))
        labels[i].place(x=10 + (120 * i), y=105)
        entries.append(tk.Entry(area)
        entries[i].insert(0, "Change Ip")
        entries[i].place(x=10 + (120 * i), y=160, width=100)