Question

需要实现的功能是：单击Tkinter按钮时，会更改条目的文本。这是代码片段：

import Tkinter as tk

def create_heatmap_button_callback():
    path_entry.delete(0, tk.END)
    path_entry.insert(0, "clicked!")    

def main():
    root = tk.Tk()
    path_entry = tk.Entry(master = root, text = "not clicked")
    path_entry.grid(row=1, column=0, sticky = tk.W)

    create_heatmap_button = tk.Button(master = root, text = "create map", command = create_heatmap_button_callback)
    create_heatmap_button.grid(row=2,column=0,sticky = tk.W)

    tk.mainloop()   

if __name__ == "__main__":
    global path_entry
    main()

当点击按钮时，这是输出：

NameError：未定义全局名称“path_entry”

这样做的正确方法是什么？

Answer 1

我可能发现错误，path_entry需要声明为global.Python的全局变量的行为与其他语言不同。

import Tkinter as tk

def create_heatmap_button_callback():
    #global path_entry
    path_entry.delete(0, tk.END)
    path_entry.insert(0, "clicked!")

def main():    
    root = tk.Tk()
    global path_entry
    path_entry = tk.Entry(master = root, text = "not clicked")
    path_entry.grid(row=1, column=0, sticky = tk.W)

    create_heatmap_button = tk.Button(master = root, text = "create map", command = create_heatmap_button_callback)
    create_heatmap_button.grid(row=2,column=0,sticky = tk.W)

    tk.mainloop()

if __name__ == "__main__":

    main()

单击按钮时更改Tkinter Entry的文本

1 个答案: