Python Function Arguments

Introduction

Function arguments are the values passed to a function when calling it. Python supports various types of arguments that give you flexibility in writing functions.

Example 1: Positional Arguments

def sum(name, age):
    print(f"Hello {name}, you are {age} years old.")

sum('Rohit', 25)

Arguments passed are assigned based on their position.

Output:

Hello Rohit, you are 25 years old.

Example 2: Keyword Arguments

def sum(name, age):
    print(f"Hello {name}, you are {age} years old.")

sum(age=30, name='Sonia')

Arguments are passed using parameter names; order does not matter.

Output:

Hello Sonia, you are 30 years old.

Example 3: Default Arguments

def sum(name, age=20):
    print(f"Hello {name}, you are {age} years old.")

sum('Amit')
sum('Nisha', 28)

Parameters can have default values used if no argument is passed.

Output:

Hello Amit, you are 20 years old.
Hello Nisha, you are 28 years old.

Example 4: Variable-length Positional Arguments (*args)

def sum_all(*args):
    total = 0
    for num in args:
        total += num
    print(f"Sum is {total}")

sum_all(1, 2, 3, 4)

<code>*args</code> collects all positional arguments as a tuple.

Output:

Sum is 10

Example 5: Variable-length Keyword Arguments (**kwargs)

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

print_info(name='Raj', age=24, city='Delhi')

<code>**kwargs</code> collects keyword arguments as a dictionary.

Output:

name: Raj
age: 24
city: Delhi