title: How to check if there is a missing argument
body: <p>I wrote this code:</p>
  
  <pre><code>def suma(num1,num2):
  
      if(isinstance(num1,int)) or (isinstance(num2,int)) :
         if num1&lt;0 or num2&lt;0:
              print("iavo")
         elif num1!=int(num1)or num2!=int(num2):
              print("iao")
         else:
              suma_a = num1+num2
              return suma_a
      else:
          print("ia")
  </code></pre>
  
  <p>I need to check whether there is a <code>num1</code> or <code>num2</code>. If there is none, the program should print that there is a missing argument.</p>