关于python中Tkinter在窗口中新建窗口，get方法无法获取到Entry中的内容（获取为空）的解决方法

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import tkinter
import tkinter.messagebox
from student import *


class StudentManager(object):
    def __init__(self):
        # 存储学员数据
        self.student_list = []
        self.student_manager = tkinter.Tk()
        self.student_manager.title('学员信息管理系统')
        self.student_manager.geometry('600x500')

    def add_student(self):
        def bc():
            ret = tkinter.messagebox.askokcancel(title='提交学员信息', message='是否确认提交？')
            students = Student(e1.get(), e2.get(), e3.get())
            if ret:
                tkinter.messagebox.showinfo(title='提示', message='学员信息提交成功')
                self.student_list.append(students)
                add_students.destroy()
            else:
                tkinter.messagebox.showinfo(title='提示', message='学员信息取消提交')
                add_students.destroy()
        add_students = tkinter.Tk()  # 此处要修改！！！！！！
        add_students.title('添加学员')
        add_students.geometry('250x150')
        lab = tkinter.Label(add_students, text='学员姓名')
        lab1 = tkinter.Label(add_students, text='学员性别')
        lab2 = tkinter.Label(add_students, text='学员电话')
        lab.grid(row=0, column=0)
        lab1.grid(row=1, column=0)
        lab2.grid(row=2, column=0)
        e1 = tkinter.StringVar()
        e2 = tkinter.StringVar()
        e3 = tkinter.StringVar()
        entry = tkinter.Entry(add_students, textvariable=e1)
        entry1 = tkinter.Entry(add_students, textvariable=e2)
        entry2 = tkinter.Entry(add_students, textvariable=e3)
        entry.grid(row=0, column=1)
        entry1.grid(row=1, column=1)
        entry2.grid(row=2, column=1)
        bt = tkinter.Button(add_students, text='提交保存', command=bc)
        bt.grid(row=3, column=1)
        add_students.mainloop()