title: How to implement "positional-only parameter" in a user defined function in python?
body: <p>How can I implement "positional-only parameter" for a function that is user defined in python?</p>
  
  <pre><code>def fun(a, b, /):
      print(a**b)
  
  fun(5,2)        # 25
  fun(a=5, b=2)   # should show error
  </code></pre>