Loops in Python
What are loops in Python?
Loops are a construct in programming that allow you to repeat a block of code multiple times. They are a powerful tool that enables you to automate repetitive tasks and process large amounts of data. In Python, there are two types of loops: for loops and while loops.
A for loop in Python is used to iterate over a sequence of values, such as a list, tuple, or string. The basic syntax of a for loop is as follows:
In this example, we define a list of fruits and then use a for loop to iterate over each element in the list and print it to the console.
You can also use the range() function to iterate over a sequence of numbers. For example:
This code will print the numbers 0 through 4 to the console.
The while loop
The while loop is used to repeat a set of instructions as long as a certain condition is true. Here's an example:
In this example, we start with a variable i that has a value of 0. We then use a while loop to print the value of i to the console and increment its value by 1 until i is no longer less than 5.
You can also use loops inside of other loops. This is known as nested looping. Here's an example:
In this example, we use a for loop to iterate over the numbers 0 through 2, and then use a nested for loop to iterate over the numbers 0 through 1 for each value of i. This will print the pairs (0, 0), (0, 1), (1, 0), (1, 1), (2, 0), and (2, 1) to the console.
Loops are an essential part of Python programming. They allow you to repeat a set of instructions multiple times without having to write them out every single time. There are two main types of loops in Python: the for loop and the while loop. You can also use loops inside of other loops (nested looping) to create more complex programs.