Python Tkinter窗口打开时不带标签

我有一个文本文件，里面有一些法语动词：

accepter – to accept
adorer – to adore
aimer – to like
annuler – to cancel
apporter – to bring

我有一个Python文件，它将打开这个文件，阅读它并生成一些关于将这些动词变为现在时的随机问题：

from tkinter import *
from tkinter import ttk
from definitions import *
from random import *
def check_conjugation(*args):
    answer_given = str(answer.get())
    correct_answer = present_tense_regular(random_verb, random_pronoun)
    def unaccent(word):
        output = ""
        for x in word:
            english_letters = [y for y in "abcdefghijklmnopqrstuvwxyz"]
            accents = [y for y in "àâáçèéêëìíîòóôùúû"]
            replacements = [y for y in "aaaceeeeiiiooouuu"]
            if x in english_letters:
                output += x
            else:
                for y in range(len(accents)):
                    if x == accents[y]:
                        output += replacements[y]
                        break
        return output     
    unaccented_answer_given = unaccent(answer_given)
    unaccented_correct_answer = unaccent(correct_answer)
    if answer_given == correct_answer:
        decision.set("That is correct, well done!")
        next_button.focus()
        fr_conj_present.bind('<Return>', set_new_pair)
    elif unaccented_answer_given == unaccented_correct_answer:
        decision.set(
"""You have conjugated correctly, well done!
However there were missing accents in your typed answer.
The correct answer was %s""" % correct_answer)
        next_button.focus()
        fr_conj_present.bind('<Return>', set_new_pair)
    else:
        decision.set("That is not correct. Try again.")

    list_of_verbs = []
    with open("french_regular_verbs.txt", 'r') as file:
        for line in file:
            verb = ""
            for letter in line:
                if letter == " ":
                    break
                else:
                    verb += letter
            list_of_verbs.append(verb)
    number_of_verbs = len(list_of_verbs)

def new_pair():
    global random_pronoun
    global random_verb
    random_number = randint(0,number_of_verbs - 1)
    random_verb = list_of_verbs[random_number]
    random_pronoun = ["je", "tu", "il", "vous", "nous", "ils"][randint(0,5)]
    return ((random_verb, random_pronoun))

def set_new_pair(*args):
    question_text.set("Conjugate the verb '%s' to the pronoun '%s' in the present tense:" % new_pair())
    decision.set("")
    conjugation.focus()
    fr_conj_present.bind('<Return>', check_conjugation)


def present_tense_conjugate():
    global mainframe, fr_conj_present, answer, decision, next_button, conjugation, question_text, number_of_verbs, list_of_verbs
    list_of_verbs = []
    with open("french_regular_verbs.txt", 'r') as file:
        for line in file:
            verb = ""
            for letter in line:
                if letter == " ":
                    break
                else:
                    verb += letter
            list_of_verbs.append(verb)
    number_of_verbs = len(list_of_verbs)
    new_pair()
    fr_conj_present = Tk()
    fr_conj_present.title("Conjugating verbs")
    mainframe = ttk.Frame(fr_conj_present, padding="3 3 12 12")
    mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
    fr_conj_present.columnconfigure(0, weight=1)
    fr_conj_present.rowconfigure(0, weight=1)
    answer = StringVar()
    decision = StringVar()
    decision.set("")
    question_text = StringVar()
    question_text.set("Conjugate the verb '%s' to the pronoun '%s' in the present tense:" % new_pair())
    ttk.Label(mainframe, textvariable=question_text).grid(column=1, row=1)
    conjugation = ttk.Entry(mainframe, width=20, textvariable=answer)
    conjugation.grid(column=1, row=2, sticky=(W, E))
    ttk.Label(mainframe, textvariable=decision).grid(column=1,row=3, sticky=(W, E))
    ttk.Button(mainframe, text="Check", command=check_conjugation).grid(column=2,row=2)
    next_button = ttk.Button(mainframe, text="Next", command=set_new_pair)
    next_button.grid(column=2,row=3)
    for child in mainframe.winfo_children():
        child.grid_configure(padx=5, pady=5)
    conjugation.focus()
    fr_conj_present.bind('<Return>', check_conjugation)
    fr_conj_present.mainloop()

但每当我运行主窗口（上面的第三段代码）并选择“法语”，然后选择“将动词变为现在时”，它就会打开窗口，但不会出现任何问题等：

当它看起来像：

---

你知道我做错了什么吗？

因为一些奇怪的Tkinter标签不能与

textvariable

参数一起工作，不过如果我们使用

text='Hello'

它就可以完美地工作

因此，如果您将代码更改为

 txt = "Conjugate the verb '%s' to the pronoun '%s' in the present tense:" % new_pair()
 ttk.Label(mainframe, text=txt).grid(column=1, row=1)

然后标签将在UI中可见，我认为您还需要更新其他标签，看起来更具体于在现有标签上创建的新框架。

Read

 txt = "Conjugate the verb '%s' to the pronoun '%s' in the present tense:" % new_pair()
 ttk.Label(mainframe, text=txt).grid(column=1, row=1)