我最近在学习Tkinter，我想尝试构建一个在线程序，允许人们创建文档并编辑它们，或者在Tkinter窗口中创建它们。但是，由于某种原因，我的代码没有显示应该保存和写入文件的Tkinter按钮。忘记编辑文档部分，我想首先解决这个问题。

from tkinter import *
action = input("Do you want to create or edit a doc? c for create, e for edit:\n").lower()

if action == 'c':
  name = input("What do you want to name your document? ").lower()
  fs = open(name + ".txt", 'w')
  txtData = ""
  tab = Tk()
  tab.geometry('500x400')
  tab.resizable(0,0)
  inputTxt = Text(tab, width = 200, height = 100, padx = 30, pady = 30)
  inputTxt.pack()
  def save():
    inputTxtGet = inputTxt.get(1.0, 'end-1c')
    txtData = inputTxtGet
    fs.write(txtData)
    fs.close()
  saveBtn = Button(tab, text = "Write and Save", command = save, background = "green", activebackground = "lime").pack()

我不明白哪里出了问题，因为没有错误出现。请帮我调试一下。