Use of *args and **kwargs

In Python, *args and **kwargs are special keywords that allow you to pass a variable number of arguments to a function.

*args is used to pass a non-keyworded, variable-length argument list to a function. For example:

*Pass a non-keyworded, variable-length argument list to a function in Python using args

def print_args(*args):
    for arg in args:
        print(arg)

print_args(1, 2, 3)  # prints 1, 2, 3
print_args("a", "b", "c")  # prints a, b, c

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**kwargs is used to pass a keyworded, variable-length argument list to a function. For example:

**Pass a keyworded, variable-length argument list to a function in Python using kwargs

def print_kwargs(**kwargs):
    for key, value in kwargs.items():
        print(f"{key} = {value}")

print_kwargs(name="Alice", age=20)  # prints name = Alice, age = 20
print_kwargs(a=1, b=2, c=3)  # prints a = 1, b = 2, c = 3

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Both *args and **kwargs can be used to pass arguments to a function in a flexible way, allowing you to pass a varying number of arguments to a function.

You can also use both *args and **kwargs in the same function definition, but *args must come before **kwargs.

For example:

**Use *args and kwargs in one function in Python

def print_args_and_kwargs(*args, **kwargs):
    for arg in args:
        print(arg)
    for key, value in kwargs.items():
        print(f"{key} = {value}")

print_args_and_kwargs(1, 2, 3, name="Alice", age=20)

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This would print:

---

1
2
3
name = Alice
age = 20