Python 3-Tcl / Tk如何從文件對話框獲取文件名並更改標簽

Question

我正在嘗試選擇一個文件並使標簽顯示其名稱。

def onOpen():
    photo_label = filedialog.askopenfilename()
    pass


#photo code
photo = PhotoImage(file="smile.png")
photo_label = Button(image=photo, command=onOpen).grid()
#I am attempting to change text=photo_label to reflect the file name
text = Label(text=photo_label) # included to show background color
text.grid()

Answer 1

您可以使用StringVar並將其傳遞給標簽的textvariable選項，以便每次更改變量的值時，標簽的文本也是如此：

import tkinter as tk
from tkinter import filedialog

def onOpen():
    """ Ask the user to choose a file and change the update the value of  photo_label"""
    photo_label.set(filedialog.askopenfilename())

root = tk.Tk()
# StringVar that will contain the file name
photo_label = tk.StringVar(root)

photo = tk.PhotoImage(file="smile.png")
tk.Button(root, image=photo, command=onOpen).grid()

text = tk.Label(root, textvariable=photo_label)
text.grid()

root.mainloop()

備注： grid()返回None因此在您的代碼中，
photo_label = Button(image=photo, command=onOpen).grid()
剛剛將值None分配給photo_label 。