Tkinter 回溯变量未定义

Question

我有一个名为 to1 的函数，它从条目小部件中获取输入 在文件中搜索它会显示带有所有相似行文本的按钮。现在 get_button_text1 函数获取按钮 ID 并提取特定按钮的文本，并将其存储在名为 btn_text 的变量中。现在的问题是，当我在新函数 find1 中调用这个全局变量 btn_text 时，它会给出一个错误 btn_text 未定义。 我分别附上代码和回溯错误。

def get_button_text1(button_id):
    global btn_text
    """Function to retrieve text of a button with a given identifier"""
    # print(ubtn)
    btn_text = ubtn1[button_id]['text']
    # dataIO.valueentry(btn_text, None, None, None)
    # top1.destroy()
    # print(btn_text)

    return btn_text


# from home import *
def to1():
    global top1
    top1 = Toplevel()
    string_list = []  # empty list to store the strings
    c = desentry1.get()
    a = str(c)
    # print(a)
    b = ""
    if a.startswith("UC") or a.startswith("uc") or a.startswith("nibp"):
        a = a.upper()
    else:
        a = a.capitalize()
    b = a
    # print(b)
    search_words = b.split()
    i = 0
    with open("materialcode.txt", "r") as file:
        lines = file.readlines()
    # key = k.upper()

    for line in lines:
        # if word in key:

        for word in search_words:
            if word in line:
                global buttons
                # print(line)
                buttons = {}

                string_name = f"string1_{i + 1}"  # create a variable name with a unique number
                string_value = f"{line}"  # create the string value
                locals()[string_name] = string_value  # dynamically create the variable and assign the string value
                string_list.append(locals()[string_name])  # add the variable to the list
                button_text = locals()[f"string1_{i + 1}"]  # create the text for the button
                button = ttk.Button(top1, text=button_text, command=lambda button_id=i: get_button_text1(
                    button_id))  # create the button with the text
                button.pack()  # add the button to the GUI
                buttons[i] = button
                # print(button)
                ubtn1.update(buttons)
                i += 1
                break
    # print(string_list)
# -----------------------------------------------------------------------------funx
def find1():
    to1()
    desentry1.delete(0,END)
    # ov1=StringVar()
    ov1=btn_text
    print(ov1)
    desentry1.insert(0,ov1)

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\tkinter\__init__.py", line 1948, in __call__
    return self.func(*args)
           ^^^^^^^^^^^^^^^^
  File "C:\Users\admin\Desktop\Dekstop Folder\pycharm\Uni-Card\sepr.py", line 92, in find1
    ov1=btn_text
        ^^^^^^^^
NameError: name 'btn_text' is not defined

我希望我的条目小部件文本更改为存储在 btn_text 变量中的内容。

Answer 1

这是针对您的问题的最小可重现示例。 它开箱即用，只包含必要的部件。

import tkinter as tk


def print_text(x):
    print(btn_strings[x])


def to1():
    global btn_strings

    btn_strings = []  # empty list to store the strings
    b = 'hello world'
    search_words = b.split()

    with open("search_text.txt", "r") as file:
        lines = file.readlines()

    i = 0
    for line in lines:
        for word in search_words:
            if word in line:
                print('found', word)
                btn_strings.append(word)
                button = tk.Button(root, text=word, command=lambda v=i: print_text(v))
                button.pack()
                i += 1
                break


if __name__ == "__main__":
    root = tk.Tk()
    to1()
    root.mainloop()

我的

search_text.txt

文件包含以下几行：

stackoverflow
hello
world
spam
text
python

Answer 2

只有在单击其中一个按钮时才需要从

to1()

返回，因此需要使顶层窗口像模态对话框一样。然后你需要关闭里面的顶层窗口

get_button_text1()

.

下面是修改后的

get_button_text1()

和

to1()

：

def get_button_text1(button_id):
    global btn_text
    btn_text = ubtn1[button_id]['text']
    # close the toplevel
    top1.destroy()
    return btn_text


def to1():
    global top1
    top1 = Toplevel()
    string_list = []  # empty list to store the strings
    c = desentry1.get()
    a = str(c)
    # print(a)
    b = ""
    if a.startswith("UC") or a.startswith("uc") or a.startswith("nibp"):
        a = a.upper()
    else:
        a = a.capitalize()
    b = a
    # print(b)
    search_words = b.split()
    i = 0
    with open("materialcode.txt", "r") as file:
        lines = file.readlines()
    # key = k.upper()

    for line in lines:
        # if word in key:

        for word in search_words:
            if word in line:
                global buttons
                # print(line)
                buttons = {}

                string_name = f"string1_{i + 1}"  # create a variable name with a unique number
                string_value = f"{line}"  # create the string value
                locals()[string_name] = string_value  # dynamically create the variable and assign the string value
                string_list.append(locals()[string_name])  # add the variable to the list
                button_text = locals()[f"string1_{i + 1}"]  # create the text for the button
                button = ttk.Button(top1, text=button_text, command=lambda button_id=i: get_button_text1(
                    button_id))  # create the button with the text
                button.pack()  # add the button to the GUI
                buttons[i] = button
                # print(button)
                ubtn1.update(buttons)
                i += 1
                break
    # print(string_list)

    # make this toplevel like a dialog
    top1.grab_set()
    top1.wait_window()