# Positional-only Parameter in Python3.8

• Last Updated : 03 Jul, 2020

Python introduces the new function syntax in Python3.8.2 Version, Where we can introduce the `/` forward slash to compare the positional only parameter which comes before the `/` slash and parameters that comes after `*` is keyword only arguments. Rest of the arguments that are come between `/` and `*` can be either positional or keyword type of argument.
That means we can combine positional arguments and regular arguments in such a way all the non-positional argument comes after `/` slash.

Syntax:

```def function(a, b, /, c, d, *, e, f):
# Function Body
pass
```

Where a and b are positional argument, c and d can be either positional or keyword or e and f are strictly keyword type argument.

In the image given below, we can see that power function is a builtin function in Python’s math library and this function uses `/` slash to enable the positional only argument and now we can implement the same functionality with the help of this version.

Example #1 :
In this example we can see that by using positional only argument we can implement the function with the fixed position as we can say only in built-in functions before this python version. With the help of this, we are able to make our program more robust.

 `# Positional-Only argument ``def` `function(a, b, ``/``, c, d, ``*``, e, f):``    ``print` `(a, b, c, d, e, f)`` ` `function(``1``, ``2``, ``3``, d ``=` `4``, e ``=` `5``, f ``=` `6``) ``# It works fine``function(``1``, ``2``, ``3``, d ``=` `4``, ``5``, f ``=` `6``) ``# Error occurred`

Output :

Example #2 :

 `# Positional-Only argument ``def` `function(a, b, ``/``, ``*``*``kwargs):``    ``print` `(a, b, kwargs)`` ` `function(``1``, ``2``, a ``=` `4``, b ``=` `5``, c ``=` `6``) ``# It works fine``function(a ``=` `1``, ``2``, a ``=` `4``, b ``=` `5``, c ``=` `6``) ``# Error occurred`

Output :

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