args and kwargs in python

*args in Python

*args are best used when we want to pass list of arguments.
Basic usage

 def listOfValues(*args): print(args) listOfValues(1,2,3) 

the output will be (1,2,3)

print(args) will print a tuple of all the arguments that we are passing in when calling the function.

Example 2 passing list or dictionary

 def iterable(*args): print(args) iterable([1,2,4,5]) 

this will print a tuple of list. Something like this ([1,2,3,4,5],)

Note: If you are familiar with ES6 rest operator. *args works a lot similar rest operator in ES6.

**kwargs in Python

**Kwargs accepts named arguments instead of positional arguments. When we use **Kwargs in parameter and try to print the values we get a dictionary.

 def getValues(**kwargs): print(kwargs) getValues(a=1,b=2) 

The output is going to be {"a":1,"b":2}

another example where we use **kwargs for adding numbers

 def add(**kwargs): res = 0 for k in kwargs.values(): res+=k print(res) add(a=1,b=2, c=3) 

Output is 6

Note:- The order of parameters has to be in the exact order
1. Standard arguments
2. *args arguments
3. **kwargs arguments