Welcome to the Control Structures page! This section will introduce you to the fundamental concepts of control structures in programming. Control structures are essential for directing the flow of a program and making decisions based on certain conditions. We’ll use interactive Python examples to help you understand these concepts.
Control structures are constructs that allow you to control the flow of execution in your programs. They enable you to make decisions, repeat actions, and manage the order in which statements are executed.
Conditional statements allow you to execute certain code blocks based on specific conditions. The most common conditional statements are if
, elif
, and else
.
In the example below, we use an if
statement to check if a number is positive:
This is similar to checking if a traffic light is green before proceeding.
In the example below, we use an if-else
statement to check if a number is positive or negative:
This is like checking if a traffic light is green or red before deciding whether to go or stop.
In the example below, we use an if-elif-else
statement to check if a number is positive, negative, or zero:
This is like checking if a traffic light is green, red, or yellow before deciding whether to go, stop, or slow down.
Loops allow you to repeat a block of code multiple times. The most common types of loops are for
and while
loops.
For loops are used to iterate over a sequence (such as a list, tuple, or string) or other iterable objects.
In the example below, we use a for
loop to print numbers from 1 to 5:
In the example below, we use a for
loop to iterate over a list of fruits:
While loops are used to repeat a block of code as long as a condition is true.
In the example below, we use a while
loop to print numbers from 1 to 5:
Python does not have a built-in do-while
loop, but you can simulate it using a while
loop with a break
statement.
In the example below, we simulate a do-while
loop to print numbers from 1 to 5:
This is like following a recipe that tells you to stir a mixture for a certain number of times.