Loops are one of the most essential and powerful concepts in programming. They allow us to execute a block of code multiple times, making it easy to work with large amounts of data and perform repetitive tasks. In Python, there are two main types of loops:
for loops and
while loops. Let's dive in and see how they work.
for loop in Python is used to iterate over a sequence, such as a list, tuple, or string. It allows you to execute a block of code for each item in the sequence. The general syntax for a
for loop is:
Here's a simple example that iterates through a list of numbers and prints each one:
You can also use the
range() function to generate a sequence of numbers for iteration. For example, to print numbers 0 through 9:
while loop in Python executes a block of code as long as a certain condition is
True. The general syntax for a
while loop is:
Here's an example that prints numbers from 1 to 5 using a
In this example, the loop will continue to execute as long as the value of
count is less than or equal to 5. After each iteration,
count is incremented by 1.
Be careful with
while loops, as it's possible to create an infinite loop if your condition never becomes
False. Always ensure there's a way to break out of the loop.
Loop Control Statements
There are two loop control statements in Python that can alter the flow of loops:
break: This statement is used to exit the loop prematurely, stopping any further iterations.
continue: This statement is used to skip the rest of the current iteration and move on to the next one.
Here's an example that demonstrates the use of both
In this example, the
continue statement skips the number 5, and the
break statement stops the loop when
i reaches 8.
Now that you've got a good grasp of
while loops in Python, you can start iterating through data and performing tasks more efficiently. Happy looping!
What are the two main types of loops in Python?
The two main types of loops in Python are
for loops and
For loops are used to iterate over a sequence, while
while loops execute a block of code as long as a certain condition is
How do I create a `for` loop in Python?
To create a
for loop in Python, use the following syntax:
for variable in sequence:, followed by an indented block of code to execute for each item in the sequence.
How do I create a `while` loop in Python?
To create a
while loop in Python, use the following syntax:
while condition:, followed by an indented block of code to execute while the condition is
What are loop control statements in Python?
Loop control statements in Python are
Break is used to exit the loop prematurely, while
continue is used to skip the rest of the current iteration and move on to the next one.
How do I use the `range()` function with a `for` loop?
You can use the
range() function to generate a sequence of numbers for iteration in a
for loop. For example:
for i in range(10): would create a loop that iterates through the numbers 0 to 9.