Summary
This chapter covers how to use if/else expressions in Python to execute different code blocks based on conditional evaluations.

General domain of usage
Text processing

Now that we're acquainted with conditional operators and know how to use them, we can branch our code based on certain conditions. In Python, this is achieved with the following structure:

```python
if condition:
   execute this if the condition is true
else:
   execute this if the condition is false
```

In the example above, the `condition` can be either a *conditional statement* or a *boolean value*. For example, it might look like `a != 4` or `b > 100`. The commands beneath `if` and `else` are instructions to be executed depending on whether the condition is met. These could be `print()` functions, variable assignments, arithmetic operations, string manipulations, and more.

Let's walk through an example: Suppose you have a string and you want to determine if it's long. We'll define a string as *'long'* if it contains more than `20` characters.

# Assign some variable
test = "small string"

# Conditional statement
if len(test) > 20:
    print("This string is long!")
else:
    print("Nothing special")
    
# Check on different string
test = "This string is very-very and very large"

# Conditional statement
if len(test) > 20:
    print("This string is long!")
else:
    print("Nothing special")

> **Note**
>
> Remember, the code blocks under the `if` and `else` statements should have consistent indentation (e.g., 2 spaces, 4 spaces, etc.).

Given the provided `if/else` block, what will be the output if `a = 95`, and what if `a = 56`?

Python is an interpreted high-level general-purpose programming language. Unlike HTML, CSS, and JavaScript, which are primarily used for web development, Python is versatile and can be used in various fields, including software development, data science, and back-end development. In this course, you'll explore the core aspects of Python, and by the end, you'll be crafting your own functions!

Dive into the basics of Python, explore your workspace, and perform simple math operations. Learn how to write readable code using comments and handle both basic and advanced mathematical expressions while displaying your results.

Learn how to store and manage data in Python by working with numbers, text, and variables. Understand how to assign values, follow naming conventions, and explore different data types. Gain hands-on experience with string operations, indexing, slicing, and memory recall techniques to efficiently manipulate text in Python.

Learn how to use comparison and logical operators, work with conditional expressions, and apply membership and type comparisons. Build a strong foundation in writing programs that respond dynamically to different conditions using if/else and if/elif/else structures.

Expand your understanding of data types by learning how to group multiple attributes within a single variable. Explore lists, tuples, and dictionaries to efficiently store and manage structured data, along with essential methods for manipulation and retrieval.

Master the art of writing loops in Python—essential constructs for iterating over lists, tuples, dictionaries, and other data structures. Learn to use while and for loops effectively, explore the range function, and work with nested loops to handle complex iteration patterns.

Explore essential built-in functions in Python and take the next step by creating your own. Learn how to define functions, use conditional logic, modify existing functions, and work with lambda expressions to write efficient, reusable code.

How to Use if/else Expressions in Python

Awesome!

How to Use if/else Expressions in Python