Understanding Python Loops: Repeating Code with Control Structures

Explore how Python loops enable you to execute a block of code multiple times. Learn about the different types of loops and control structures that help manage repetitive tasks, ensuring efficient and organized code execution. This guide provides a foundational understanding of how loops work in Python.

Python Loops

Python loops let us run a statement or group of statements multiple times.

Usually, statements run one after another, but sometimes you need to repeat a block of code several times. Control structures help manage these repetitive tasks.

Flowchart of a Loop

Here is a diagram illustrating a loop statement:

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Types of Loops in Python

Python has the following types of loops:

Loop Type	Description
while loop	Repeats a statement or group of statements while a given condition is TRUE. It tests the condition before running the loop body.
for loop	Runs a sequence of statements multiple times and simplifies managing the loop variable.
nested loops	You can use one or more loops inside another loop.

Python Loop Control Statements

Loop control statements change the normal sequence of execution. When leaving a scope, all automatic objects created in that scope are destroyed. Python supports the following control statements:

Control Statement	Description
break statement	Ends the loop and transfers execution to the statement right after the loop.
continue statement	Skips the rest of the loop body and immediately retests its condition before repeating.
pass statement	Used when a statement is required syntactically but you do not want any command or code to run.

Syntax


while condition:
    # loop body

Output


Loop executed until condition is false.

Syntax


for item in sequence:
    # loop body

Output


Loop executed for each item in sequence.

Syntax


for i in range(5):
    for j in range(3):
        # nested loop body

Output


Nested loops executed for each combination of i and j.

Syntax


while condition:
    if some_condition:
        break

Output


Loop terminated with break statement.

Syntax


while condition:
    if some_condition:
        continue

Output


Loop continued with continue statement.

Syntax


def function():
    pass

Output


pass statement used in function.