Course Content

Python Functions Tutorial

1. What is a Function in Python?

What Is Function?Challenge: Building Functions Arguments Return Value Function Body Built-in Functions

2. Positional and Optional Arguments

Positional Arguments Challenge: Positional Arguments Optional Arguments Challenge: Optional Arguments

3. Arbitrary Arguments

Arbitrary Arguments Arbitrary Keyword Arguments Combination of Positional and Optional Arguments

4. Function Return Value Specification

Single Return Value Multiple Return Values None Return Value Generator Functions Challenge: Traffic lights

5. Recursion and Lambda Functions

Recursion Challenge: Search Engine Lambda Functions Immediately Invoked Lambda Expression Writing Effective and Maintainable Functions

Positional Arguments

In Python, positional arguments are function arguments passed to a function based on their position or order. When defining a function, you can specify the parameters it expects. When calling the function, you provide the corresponding arguments in the same order as the parameters.

In all the functions of the previous chapters, we used positional arguments by explicitly indicating the arguments in the () parentheses, and then calling the function with the arguments in the appropriate order.

We can also specify arguments using a dictionary with the argument name as a keyword and the argument value as a value:

Using this type of specification allows us to specify arguments in any order.


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# Function with two positional arguments
def greet(name, age):
    print(f'Hello, {name}! You are {age} years old.')

# Calling the `greet()` function using dictionary
greet(age=25, name='Alex')

# Calling the `greet()` function using ordered values
greet('Alex', 25)

This method of setting arguments is preferable because it enhances the readability and interpretability of the code.

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Section 2. Chapter 1