如何删除tkinter函数中创建的标签？dlttxt()函数实现遇阻

问题核心是你在svtxt()函数里创建的标签属于局部变量，函数执行结束后无法再引用这些标签，导致直接调用label.destroy()无效。解决方法是用一个全局列表存储所有动态创建的标签，之后在删除函数里遍历列表销毁每个标签。

修改步骤： #

• 定义全局列表用于保存所有创建的标签
• 在svtxt()中，每次创建标签后将其添加到列表
• 在dlttxt()中，遍历列表销毁每个标签，同时清空列表并重置ycord

修改后的完整代码： #

from tkinter import *
from tkinter import ttk

# setting the window up
root = Tk()
scrw, scrh = root.winfo_screenwidth(), root.winfo_screenheight()
root.title('note app')
root.geometry('500x500-{}+{}'.format(int(scrw/2-250), int(scrh/2-270)))
root.resizable(False, False)
# ---------------------
# setting images
eyeon = PhotoImage(file='tk_imgs/eyeon.png',)
eyeoff = PhotoImage(file='tk_imgs/eyeoff.png',)
# ------------

ycord = 0
# 全局列表存储所有动态创建的标签
labels_list = []

def svtxt():
    global ycord
    label = Label(root, text=entxt.get())
    if entxt.get():
        label.place(x=250, y=ycord)
        ycord += 22
        # 将标签加入全局列表
        labels_list.append(label)

onoff = False
def chngtxt():
    global onoff
    if onoff:
        entry.config(show='*')
        showtxt.config(image=eyeoff)
        onoff = False
    else:
        entry.config(show='')
        showtxt.config(image=eyeon)
        onoff = True

def dlttxt():
    '''this function has to
    delete all the packed labels
    '''
    global ycord
    # 遍历销毁每个标签
    for label in labels_list:
        label.destroy()
    # 清空列表并重置y坐标
    labels_list.clear()
    ycord = 0

# setting entry widget
entxt = StringVar()
entry = Entry(root, borderwidth=4, textvariable=entxt, show='*')
entry.place(x=0, y=0) 
entry.focus()
# ------------

# setting show text button
showtxt = Button(root, command=chngtxt, pady=5, image=eyeoff)
showtxt.place(x=200, y=-2)
# ------------

#  setting save text button
sbutton = Button(root, text='save text', command=svtxt)
sbutton.place(x=50, y=35)
# ------------

# setting delete text button
dbutton = Button(root, text='Delete all', command=dlttxt)
dbutton.place(x=49, y=66)
# ------------

root.mainloop()

内容的提问来源于stack exchange，提问作者NoFallToggled