- Trending Categories
- Data Structure
- Operating System
- C Programming
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to pass optional parameters to a function in Python?
A type of argument with a default value is a Python optional parameter. A function definition's assignment operator or the Python **kwargs statement can be used to assign an optional argument. Positional and optional arguments are the two sorts of arguments that a Python function can take. Values that are not required to be given in order to call a function are known as optional parameters.
Function in Python
A function is a section of code that only executes when called. You can supply parameters that is data to a function. As a result, a function may or may not return data.
Let us understand what a function in python is with the help of an example.
def demo_function(): print("Hello World") demo_function() #the demo_function() method is called.
The output obtained is as follows.
Arguments in a Function
Functions accept arguments that can contain data. The function name is followed by parenthesis that list the arguments. Simply separate each argument with a comma to add as many as you like. The function in the following example only takes one argument (fname). A first name is passed to the function when it is called, and it is utilized there to print the whole name.
Optional Arguments in Python
An argument in Python that has a default value is called an optional argument. A default value for an argument can be specified using the assignment operator. When calling a function, there is no requirement to provide a value for an optional argument. This is because, in the absence of a value, the default value will be used.
Argument default values are possible. This renders an argument unnecessary. If a default value is present for an argument, it will be used if no alternative value is provided.
Python has two primary methods for passing optional parameters. They are as follows.
Without utilizing keyword justifications.
Use keyword justifications.
Passing without using keyword arguments
The following are some major considerations when passing without keyword arguments −
When invoking a function, the order of the parameters—that is, the order in which the parameters are defined in the function—should be preserved.
The non-optional arguments' values must be provided otherwise an error will be thrown.
The default argument value can either be supplied or disregarded.
Let’s look at an example to see how optional arguments are passed.
# Python program to demonstrate a optional argument. def function(a, b=999): return a+b print(function(2, 3)) # In the function 1 is represented as 'a' in the function and #The function uses the default value of b print(function(1))
The following is the output that is generated upon executing the above program.
- How to pass keyword parameters to a function in Python?
- How to pass the parameters in the PowerShell function?
- How to pass parameters to a method in C#?
- Optional Parameters in Dart Programming
- How to pass reference parameters PHP?
- How to pass Python function as a function argument?
- How to pass pointers as parameters to methods in C#?
- How to pass parameters using param array in a C# method?
- Newman Optional Parameters & Configurations using Postman
- How to pass a dictionary as argument in Python function?
- How to pass arguments by reference in a Python function?
- How to pass arguments by value in Python function?