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Home Forums Explain the Python Functions with explanation – MindStick
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1 Answers

Anubhav Sharma
Anubhav Sharma 26 Sep 2025
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A function in Python is a reusable block of code that performs a specific task.
Instead of repeating code, you can put it inside a function and call it whenever you need.

You define a function in Python using the def keyword:

def greet():
    print("Hello, welcome to Python!")
  • def → keyword to define a function
  • greet → function name
  • () → parentheses for parameters (if any)
  • : → start of the function block
  • print(...) → function body

Calling the function:

greet()

Output:

Hello, welcome to Python!

Function with Parameters

You can pass data into a function using parameters.

def greet_user(name):
    print(f"Hello, {name}!")

Call it:

greet_user("Anna")
greet_user("John")

Output:

Hello, Anna!
Hello, John!

Function with Return Value

Functions can return data using the return keyword.

def add(a, b):
    return a + b

result = add(5, 7)
print(result)   # 12

Default Parameters

If no value is given, default values are used.

def greet_user(name="Guest"):
    print(f"Hello, {name}!")

greet_user()         # Hello, Guest!
greet_user("Alice")  # Hello, Alice!

Multiple Return Values

A function can return multiple values (as a tuple).

def calculate(a, b):
    return a+b, a-b, a*b

sum_, diff, prod = calculate(10, 5)
print(sum_, diff, prod)   # 15 5 50

Keyword Arguments

You can pass arguments in any order by naming them.

def intro(name, age):
    print(f"My name is {name} and I am {age} years old.")

intro(age=25, name="David")

Output:

My name is David and I am 25 years old.

Variable Number of Arguments

  • *args → allows multiple positional arguments
  • **kwargs → allows multiple keyword arguments
def print_numbers(*args):
    for num in args:
        print(num)

print_numbers(1, 2, 3, 4)

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

print_info(name="Sam", age=30, city="NYC")

Lambda Functions (Anonymous Functions)

Short functions written in one line using lambda.

square = lambda x: x * x
print(square(5))  # 25
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