It is possible to define a function in which one or more arguments can not accept their value with keywords. Such arguments may be called positional-only arguments.
Python's built-in input() function is an example of positional-only arguments. The syntax of input function is −
Prompt is an explanatory string for the benefit of the user. For example −
However, you cannot use the prompt keyword inside the parantheses.
name = input (prompt="Enter your name ")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: input() takes no keyword arguments
To make an argument positional-only, use the "/" symbol. All the arguments before this symbol will be treated as position-only.
Example
We make both the arguments of intr() function as positional-only by putting "/" at the end.
If we try to use the arguments as keywords, Python raises following error message −
interest = intr(amt=1000, rate=10)
^^^^^^^^^^^^^^^^^^^^^^^
TypeError: intr() got some positional-only arguments passed as keyword arguments: 'amt, rate'
A function may be defined in such a way that it has some keyword-only and some positional-only arguments.
In this function, x is a required positional-only argument, y is a regular positional argument (you can use it as keyword if you want), and z is a keyword-only argument.
The following function calls are valid −
However, these calls raise errors −
myfunction(x=10, y=20, z=30) TypeError: myfunction() got some positional-only arguments passed as keyword arguments: 'x' myfunction(10, 20, 30) TypeError: myfunction() takes 2 positional arguments but 3 were giv
The End! should you have any inquiries, we encourage you to reach out to the Vercaa Support Center without hesitation.
