title: TypeError: can only concatenate str (not "int") to str: What does it mean?
body: <pre><code>from tkinter import*
  import random
  from tkinter import messagebox
  window=Tk()
  window.title("Random Tools")
  window.configure(background="light green")
  textvaria = IntVar()
  textvaria2 = IntVar()
  
  label0 = Label(window, text = "Min", bg ="light green")
  label0.grid(row=1, column=0)
  
  spinboxmin = Spinbox(window, from_=1, to=9999, increment=1, textvariable=textvaria)
  spinboxmin.grid(row=2, column=0)
  a = spinboxmin.get()
  
  label1 = Label(window, text="Max", bg="light green")
  label1.grid(row=3, column=0)
  
  spinboxmax = Spinbox(window, from_=1, to=9999, increment=1, textvariable=textvaria2)
  spinboxmax.grid(row = 4, column =0)
  b = spinboxmax.get()
  
  def submit2():
      if a &lt;= b:
          answertext.delete('1.0', END)
      else:
          messagebox.showerror("Error", "Max must be greater than min!")
  
  submit = Button(text="Submit", command=submit2)
  submit.grid(row=4, column=2)
  
  n = random.randint(a, b+1)
  
  answertext = Text(text=n)
  answertext.grid(row=5, column=0)
  
  
  window.mainloop()
  </code></pre>
  
  <p>I'm doing a GUI for randoming numbers. But when I run this in Python Module, it said: 
  "TypeError: can only concatenate str (not "int") to str"
  Can someone help me with this?
  Thank a lot.</p>