在tkinterpython中單擊按鈕后如何洗掉串列中的特定專案

下面是一個小代碼，如果您單擊添加按鈕，則會在您輸入所需數字的位置出現一個彈出視窗。底部的數字代表您輸入的所有數字的總和。我想要實作的是在洗掉任何標簽時更新 sum_lbl 和 index_no。

代碼：

from tkinter import *

root = Tk()
root.geometry('400x400')
add_room_area_var= StringVar(None)

area_lst = []
index_no = 0

def destroy(widget):
    widget.destroy()

def add_():
    add_room_area = Toplevel(root)
    add_room_area.title('Add Room area')
    add_room_area.wm_minsize(200, 50)
    add_room_area.resizable(False, False)
    add_room_area.transient(root)

    add_r_area_frame = LabelFrame(add_room_area, text='  Room area  ', labelanchor=N)
    add_r_area_frame.config(padx=3, pady=3)
    add_r_area_frame.pack(fill=X, padx=10, pady=10)

    add_r_area_entry = Entry(add_r_area_frame, textvariable=add_room_area_var)
    add_r_area_entry.pack(fill=X)
    add_r_area_entry.focus_set()

    while True:
        def ok_():
            global index_no
            name = add_room_area_var.get()
            index_no  = 1

            entry_frame = Frame(root)
            index_lbl = Label(entry_frame, text=index_no)
            add_room_lbl = Label(entry_frame, text=name, width=12, bg='gray30', fg='white', pady=5)
            close_button = Button(entry_frame, text='X', command=lambda:destroy(entry_frame))

            entry_frame.pack(anchor=N, padx=1)
            index_lbl.pack(side=LEFT, padx=3)
            add_room_lbl.pack(fill=X, side=LEFT)
            close_button.pack(side=RIGHT)

            area_lst.append(int(name))
            add_room_area.destroy()

            area_sum = sum(area_lst)
            sum_lbl.config(text=area_sum)

        break

    ok_button = Button(add_room_area, text='Ok', command=ok_)
    ok_button.pack()

btn = Button(root, text='Add', command=add_)
btn.pack()

sum_lbl = Label(root, font=25)
sum_lbl.pack(side=BOTTOM, pady=15)

root.mainloop()

輸出：

洗掉第 3 個和第 4 個標簽后，輸出為：

uj5u.com熱心網友回復：

我建議area_lst使用框架作為鍵和兩個標簽作為每行的值更改為字典。

然后更新destroy()以用于area_lst更新總數和索引：

from tkinter import *

root = Tk()
root.geometry('400x400')
add_room_area_var= StringVar(None)

area_lst = {}  # dictionary to hold labels of each row using frame as the key

def destroy(frame):
    frame.destroy()
    del area_lst[frame]
    update_total()
    # update index of remaining rows
    for idx, (lbl, _) in enumerate(area_lst.values(), 1):
        lbl['text'] = idx

# function to update the total label
def update_total():
    area_sum = sum(int(room['text']) for _, room in area_lst.values())
    sum_lbl.config(text=area_sum)

def add_():
    add_room_area = Toplevel(root)
    add_room_area.title('Add Room area')
    add_room_area.wm_minsize(200, 50)
    add_room_area.resizable(False, False)
    add_room_area.transient(root)

    add_r_area_frame = LabelFrame(add_room_area, text='  Room area  ', labelanchor=N)
    add_r_area_frame.config(padx=3, pady=3)
    add_r_area_frame.pack(fill=X, padx=10, pady=10)

    add_r_area_entry = Entry(add_r_area_frame, textvariable=add_room_area_var)
    add_r_area_entry.pack(fill=X)
    add_r_area_entry.focus_set()

    def ok_():
        name = add_room_area_var.get()

        entry_frame = Frame(root)
        index_lbl = Label(entry_frame, text=len(area_lst) 1)
        add_room_lbl = Label(entry_frame, text=name, width=12, bg='gray30', fg='white', pady=5)
        close_button = Button(entry_frame, text='X', command=lambda:destroy(entry_frame))

        entry_frame.pack(anchor=N, padx=1)
        index_lbl.pack(side=LEFT, padx=3)
        add_room_lbl.pack(fill=X, side=LEFT)
        close_button.pack(side=RIGHT)

        # store current row to area_lst
        area_lst[entry_frame] = (index_lbl, add_room_lbl)
        add_room_area.destroy()

        update_total()

    ok_button = Button(add_room_area, text='Ok', command=ok_)
    ok_button.pack()

btn = Button(root, text='Add', command=add_)
btn.pack()

sum_lbl = Label(root, font=25)
sum_lbl.pack(side=BOTTOM, pady=15)

root.mainloop()

uj5u.com熱心網友回復：

您可以允許按鈕呼叫多個命令，因此對于您的“close_button”按鈕，我添加了另外兩個命令：從“area_lst”中洗掉名稱并使用“area_lst”的新總和更新“sum_lbl”文本

像這樣：

from tkinter import *

root = Tk()
root.geometry('400x400')
add_room_area_var= StringVar(None)

area_lst = []
index_no = 0

def destroy(widget):
    widget.destroy()

def add_():
    add_room_area = Toplevel(root)
    add_room_area.title('Add Room area')
    add_room_area.wm_minsize(200, 50)
    add_room_area.resizable(False, False)
    add_room_area.transient(root)

    add_r_area_frame = LabelFrame(add_room_area, text='  Room area  ', labelanchor=N)
    add_r_area_frame.config(padx=3, pady=3)
    add_r_area_frame.pack(fill=X, padx=10, pady=10)

    add_r_area_entry = Entry(add_r_area_frame, textvariable=add_room_area_var)
    add_r_area_entry.pack(fill=X)
    add_r_area_entry.focus_set()

    while True:
        def ok_():
            global index_no
            name = add_room_area_var.get()
            index_no  = 1

            entry_frame = Frame(root)
            index_lbl = Label(entry_frame, text=index_no)
            add_room_lbl = Label(entry_frame, text=name, width=12, bg='gray30', fg='white', pady=5)
            close_button = Button(entry_frame, text='X', command=lambda:[destroy(entry_frame), area_lst.remove(int(name)), sum_lbl.config(text=sum(area_lst))])

            entry_frame.pack(anchor=N, padx=1)
            index_lbl.pack(side=LEFT, padx=3)
            add_room_lbl.pack(fill=X, side=LEFT)
            close_button.pack(side=RIGHT)

            area_lst.append(int(name))
            add_room_area.destroy()

            area_sum = sum(area_lst)
            sum_lbl.config(text=area_sum)

        break

    ok_button = Button(add_room_area, text='Ok', command=ok_)
    ok_button.pack()

btn = Button(root, text='Add', command=add_)
btn.pack()

sum_lbl = Label(root, font=25)
sum_lbl.pack(side=BOTTOM, pady=15)

root.mainloop()

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