title: Two missing positional arguments error
body: <p>I'm learning to program interfaces and I'm facing the following problem:</p>
  
  <pre class="lang-none prettyprint-override"><code>soma() missing 2 required positional arguments: 'a' and 'b'.
  </code></pre>
  
  <p>I'd appreciate if anyone could help me resolve this issue. I've provided my code below:</p>
  
  <pre><code>from tkinter import*
  
  class calculadora:
      def __init__(self,master):
          frame=Frame(master)
          frame.pack()
          self.somar = Button(root,text = 'SOMAR',command = self.soma)
          self.somar.pack(side=TOP)
          entry1 = Entry(frame)
          entry1.pack(side=BOTTOM)
          entry2 = Entry(frame)
          entry2.pack(side=BOTTOM)
          labelR=Label(frame,text='[Aqui]').pack(side=TOP)
  
      def soma(self,a,b):
          self.a = int(entry1.get())
          self.b = int(entry2.get())
          labelR['text'] = self.a+self.b
  
  
  
  root = Tk()
  root.title("Calculadora")
  root.geometry("300x300+200+200")
  x =calculadora(root)
  
  root.mainloop()
  </code></pre>
  
  <p>Thank you.</p>