A function is like a machine in programming. You give it some input, it does a specific task, and then it gives you an output. Functions help you organize your code into reusable pieces.

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1.2 How to Define a Function ?

You define a function using the def keyword

We write a code that automatically greets if any new user comes to our website whenever we call it.

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def greet(name): print(f”Namaste, {name}!”)

If we run the above code, we won’t get an output.

It’s because creating a function doesn’t mean we are executing the code inside it. It means the code is there for us to use if we want to.

• def: This keyword starts the function
• greet: This is the name of the
• name: This is a Think of it as a placeholder for the information you will provide.
• print(f“Namaste, {name}!”): This line is the body of the function, where it does its work (printing a greeting).

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1.3 How to Call a Function ?

Once you have defined a function, you can use it by calling it. You do this by writing the function’s name followed by parentheses.

greet(“Roshan”)

Namaste, Roshan!

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Function Components: * Function Name: The name you give to the function, like greet. * Parameters: Inputs to the function, like name. * Return Value: What the function gives back after doing its job.

1.4 The return Statement

We return a value from the function using the return statement

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def calculate_area(length, width): area = length * width

return area

area = calculate_area(5, 10) print(‘Area of the rectangle:’, area)

Area of the rectangle: 50

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NOTE : Indentation is important.

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1.5 The pass Statement

The pass statement serves as a placeholder for future code, preventing errors from empty code blocks.

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def future_function():

pass

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