Functions that accept variable length key value pair as arguments

Last Updated : 15 Nov, 2022

To pass a variable-length key-value pair as an argument to a function, Python provides a feature called **kwargs.
kwargs stands for Keyword arguments. It proves to be an efficient solution when one wants to deal with named arguments in their function.

Syntax:

def functionName(**anything):
    statement(s)

Note: adding ‘**‘ to any term makes it a kwargs parameter. It accepts keywords as arguments.

Example #1:

Python3

# using kwargs
# in functions
 
 
def printKwargs(**kwargs):
    print(kwargs)
 
 
# driver code
if __name__ == "__main__":
    printKwargs(Argument_1='gfg', Argument_2='GFG')

Output:

{'Argument_1': 'gfg', 'Argument_2': 'GFG'}

Example #2:

Python3

# using kwargs
# in functions
 
 
def printValues(**kwargs):
    for key, value in kwargs.items():
        print("The value of {} is {}".format(key, value))
 
 
# driver code
if __name__ == '__main__':
    printValues(abbreviation="GFG", full_name="geeksforgeeks")

Output:

The value of abbreviation is GFG
The value of full_name is geeksforgeeks

Example #3:

Python3

# using kwargs
# in functions
# to concatenate
 
 
def concatenate(**arguments):
    # initialising empty string
    final_str = ""
     
    # Iterating over the Python kwargs
    # dictionary
    for elements in arguments.values():
        final_str += elements
    return final_str
 
 
# driver code
if __name__ == '__main__':
    print(concatenate(a="g", b="F", c="g"))

Output:

gFg

Example #4:

Python3

# using kwargs
# to multiply
 
 
def multiply(**kwargs):
   
    # initialising answer
    answer = 1
     
    # Iterating over the Python kwargs
    # dictionary
    for elements in kwargs.values():
        answer *= elements
    return answer
 
 
# driver code
if __name__ == '__main__':
    print(multiply(a=1, b=2, c=3, d=4, e=5))

Output:

T

technikue20

Improve

Previous Article

Explicitly define datatype in a Python function

How to find the number of arguments in a Python function?

Similar Reads

Python | Set 6 (Command Line and Variable Arguments)

Previous Python Articles (Set 1 | Set 2 | Set 3 | Set 4 | Set 5) This article is focused on command line arguments as well as variable arguments (args and kwargs) for the functions in python. Command Line Arguments Till now, we have taken input in python using raw_input() or input() [for integers]. There is another method that uses command line arg

Executing functions with multiple arguments at a terminal in Python

Commandline arguments are arguments provided by the user at runtime and gets executed by the functions or methods in the program. Python provides multiple ways to deal with these types of arguments. The three most common are: Using sys.argv Using getopt module/li> Using argparse module The Python sys module allows access to command-line argument

Python - Filter key's value from other key

Sometimes, while working with Python dictionary, we can have a problem in which we need to extract a value from dictionary list of the key on basis of some other key equality. This kind of problem is common in domains that include data, for e.g web development. Let's discuss certain ways in which this task can be performed. Input : test_list = [{'g

Python - Extract Key's Value, if Key Present in List and Dictionary

Given a list, dictionary, and a Key K, print the value of K from the dictionary if the key is present in both, the list and the dictionary. Input : test_list = ["Gfg", "is", "Good", "for", "Geeks"], test_dict = {"Gfg" : 5, "Best" : 6}, K = "Gfg" Output : 5 Explanation : "Gfg" is present in list and has value 5 in dictionary. Input : test_list = ["G

Add a key:value pair to dictionary in Python

Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key:value pair. While using Dictionary, sometimes, we need to add or modify the key/value inside the dictionary. Let's see how to add a key:value pair to dict

Python | Convert byteString key:value pair of dictionary to String

Given a dictionary having key:value pairs as byteString, the task is to convert the key:value pair to string. Examples: Input: {b'EmplId': b'12345', b'Name': b'Paras', b'Company': b'Cyware' } Output: {'EmplId': '12345', 'Name': 'Paras', 'Company': 'Cyware'} Input: {b'Key1': b'Geeks', b'Key2': b'For', b'Key3': b'Geek' } Output: {'Key1':'Geeks', 'Key

Python | Convert key-value pair comma separated string into dictionary

Given a string, with different key-value pairs separated with commas, the task is to convert that string into the dictionary. These types of problems are common in web development where we fetch arguments from queries or get a response in the form of strings. Given below are a few methods to solve the task. Method #1: Using dictionary comprehension

Python program to Count the Number of occurrences of a key-value pair in a text file

Given a text file of key-value pairs. The task is to count the number of occurrences of the key-value pairs in the file with Python Program to Count the occurrences of a key-value pairNaive Approach to Count the Occurrences of a key-value PairUsing Python built-in collections.CounterUsing regular expressions (re module)Text file: Naive Approach to

Python: Key Value pair using argparse

The argparse module in Python helps create a program in a command-line-environment in a way that appears not only easy to code but also improves interaction. It also automatically generates help and usage messages and issues errors when users give the program invalid arguments. Steps For Using Argparse Module: Creating a Parser: Importing argparse

Python - Convert each list element to key-value pair

Given list of elements, convert each element to a key-value pair dictionary, dividing digits equally. Input : test_list = [2323, 82, 129388, 234, 95] Output : {23: 23, 8: 2, 129: 388, 2: 34, 9: 5} Explanation : Digits distributed equally to keys and values. Input : test_list = [2323, 82, 129388] Output : {23: 23, 8: 2, 129: 388} Explanation : Digit

Article Tags :

Practice Tags :

python