What if positional argument is one of keyword arguments in Python

Short answer: an error.

Here is an example.

Define myprint():

def myprint(first_name, **kwargs):
  print(f"{kwargs}")
  print(f"first_name {first_name}")

myprint(first_name="John", **{"last_name" : "Smith"})

Output:

{'last_name': 'Smith'}
first_name John

myprint(first_name="John", **{"first_name": "Joe", "last_name" : "Smith"})

Output:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[5], line 1
----> 1 myprint(first_name="John", **{"first_name": "Joe", "last_name" : "Smith"})

TypeError: __main__.myprint() got multiple values for keyword argument 'first_name'