title: TypeError: can only concatenate tuple (not "str") to tuple in python
body: <pre><code>#-*- coding: cp857 -*-
  
  from tkinter import *
  
  ###########################################################
  
  root=Tk()
  
  root.title("MY FILM ARCHIVE")
  
  root.resizable(False, False)
  
  ########################################################### 
  
  
  def add():
      db = open(r"C:\Users\PC\Desktop\db.txt", "a+")
      enter=input("Enter your's film: "),
      db.write(enter + "\n")
      db.close()
      db.flush()    
  
  button=Button(text="Add Film!",command=add, font=("Flux",15, "bold"))
  button.pack(expand="yes", anchor="center")
  
  mainloop()
  </code></pre>
  
  <p>When I run this program and push the button I get the following error :(</p>
  
  <pre><code>TypeError: can only concatenate tuple (not "str") to tuple
  </code></pre>