在 Tkinter Python 中使用按钮输入数据前项

Question

简而言之，我的程序要求用户输入 10 个主题名称。 所以我在 Tkinter 中构建了一个框架，其中包含 10 个条目和按钮。 每个条目都有自己连接的按钮。 我已经成功地获得了单个条目的输入，但是当我使用更多时，我得到的唯一数据来自最后一个条目。

def new_wb_btn(self):
    new_wb_subjects = []
...

# Creating a list of entries variables
    subjects_ent_var = [tkinter.StringVar() for i in range(10)]

    # Creating an entry and button for each subject input
    for i in range(10):
        subject_ent = Entry(subjects_input_frm)
        subject_ent.grid(row=i, column=0, sticky="WE", ipady=5)
        subject_btn = Button(subjects_input_frm, text="OK")
        subject_btn.grid(row=i, column=1, sticky="WE", ipady=5)

        subjects_entries_buttons.append((subject_ent, subject_btn))

    for i, sub_ent_btn in enumerate(subjects_entries_buttons):
        sub_ent_btn[0].config(textvariable=subjects_ent_var[i])
        sub_ent_btn[1].config(command=self.new_wb_subjects.append(subjects_ent_var[i].get()))

    new_wb_window.mainloop()
    self.print_new_wb_info()



def print_new_wb_info(self):
    print(f"The number of subjects in the list: {len(self.new_wb_subjects)}")
    for subject in self.new_wb_subjects:
        print(f"The new subject is: {subject}")

输入输入后，我得到：

The number of subjects in the list: 10
The new subject is:
The new subject is:
...

似乎程序获取了变量并附加在 new_wb_subject 列表中，但只有空字符串

我尝试了不同的方法，例如在创建条目和按钮时在 for 循环中定义每个变量：

# Creating an entry and button for each subject input
    for i in range(10):
        subject = tkinter.StringVar()
        subject_ent = Entry(subjects_input_frm, textvariable=subject)
        subject_ent.grid(row=i, column=0, sticky="WE", ipady=5)
        subject_btn = Button(subjects_input_frm, text="OK", command=self.new_wb_subjects.append(subject.get()))
        subject_btn.grid(row=i, column=1, sticky="WE", ipady=5)

它只帮助了一点，现在我只从最后一个条目中获取数据。

Answer 1

由于您包含的代码量很难说出您到底想做什么，但看起来您在new_wb_btn和print_new_wb_info函数中没有引用相同的列表。 您要么需要将new_wb_subjects列表传递给print_new_wb_info function，要么需要使用self关键字将该列表分配为实例属性。

选项1

def new_wb_btn(self):
    new_wb_subjects = []

    ...
    ...

    new_wb_window.mainloop()
    self.print_new_wb_info(new_wb_subjects)

def print_new_wb_info(self, new_wb_subjects):
    print(f"The number of subjects in the list: {len(new_wb_subjects)}")
    for subject in new_wb_subjects:
        print(f"The new subject is: {subject}")

选项2

def new_wb_btn(self):
    self.new_wb_subjects = []
    ...
    ...

    new_wb_window.mainloop()
    self.print_new_wb_info()

def print_new_wb_info(self):
    print(f"The number of subjects in the list: {len(self.new_wb_subjects)}")
    for subject in self.new_wb_subjects:
        print(f"The new subject is: {subject}")