In Python, the slash (/) in a function parameter list represents the boundary that separates positional parameters and keyword parameters.

A slash in the argument list of a function denotes that the parameters prior to it are positional-only. Let us first see a function in Python with a parameter −

Function in Python

Example

Here we are creating a basic function in Python using the parameter myStr -

# Creating a Function
def demo(myStr):
   print("Car =: ",myStr)

# function call
demo("BMW")
demo("Tesla")

Output

Car =: BMW
Car =: Tesla

Slash in the parameter list of a function

As mentioned above, a slash in a function parameter list indicates that the preceding parameter is a positional-only parameter.

When calling a function that accepts only positional arguments, the arguments will be mapped based on their position only.

divmode() function

The divmod() function is a perfect example of a slash in a function list, i.e. it accepts positional arguments as shown below −

divmod(a, b, /)

Above, since the slash is at the end of the parameter list, parameters a and b are both positional parameters.

Let us print the documentation of divmod() using the help() functiojn in Python

# Creating a Function
def demo(myStr):
   print(help(divmod))

# function call
demo("BMW")
demo("Tesla")

Output

Help on built-in function divmod in module builtins:

divmod(x, y, /)
   Return the tuple (x//y, x%y). Invariant: div*y + mod == x.
None

Now, let us see an example of the divmod(). Both the parameters are dividend and divisor −

k = divmod(5, 2)

print(k)

Output

(2, 1)

The slash at the end of the parameter list indicates that both parameters are positional parameters. Therefore, if we call divmod() with keyword arguments, the error −

will be thrown

divmod(a = 5, b = 2)

Output

In the above example, an error occurred since the divmod() takes no keyword arguments.

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