How to implement "positional-only parameter" in a user defined function?

edit

refer

https://stackoverflow.com/questions/2...

help(pow)

o/p:
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Help on built-in function pow in module builtins:

pow(x, y, z=None, /)
Equivalent to x**y (with two arguments) or x**y % z (with three arguments)

Some types, such as ints, are able to use a more efficient algorithm when
invoked using the three argument form.

I want to know can we write a user defined function like pow (), which has positional only parameter.

Examples:

 def fun( a, b): 
        print(a**b)
 fun(a=5, b=2)   # 25
 fun(b=2,a=5)    # 25
 fun(5,2)        # 25




 def fun( a, b, /): 
        print(a**b)
 fun(5,2)        # 25
 fun(a=5, b=2)   # should show error