How to implement a _ForEach_ loop in Python

The “foreach” or “for-each” loop is a type of loop that you can use in many programming languages. It iterates over a collection of objects to perform a particular task, while iterating away details throughout the process, affording it immunity to errors.

Unlike other programming languages, the foreach loop is not a built-in feature of Python. However, you can implement similar functionality using a “for” loop instead. Additionally, you can also use the map() function as a foreach equivalent.

The map() function in Python has the same importance as the foreach loop in other programming languages. Keep reading this guide to briefly understand how to implement a foreach loop in Python.

How to implement a foreach loop in python

If you want to implement “foreach” in Python, this section has several examples to help you understand how to do so. Furthermore, the basic syntax is as follows:

This code executes for every element present in this iterable.

Implementing a Foreach Loop Using a “For” Loop

Let's look at an example of creating a program of a foreach loop using a “for” loop. In the following program, we iterate over the integer array to print all the numbers:

The result when compiled is as follows:

Implementing Foreach Loop Using “For” Loop in Advanced Program

If you want to perform an action for each iterated item of a collection, you can use the following program:

Here, the value of each number it iterates is added to a variable called sum.

When running the program, you will get the following results:

Using nested foreach loops to create a star pattern

You can also use nested foreach loops to create a star pattern.

The program written earlier creates a star pattern that looks like a right triangle.

map() function to implement foreach loop

As mentioned earlier, the map() function serves as an alternative to the foreach loop in Python. Its syntax is “map(function, iterable)” which means you have to initially define a function according to the task you want to perform. For example, your code to square the elements of a given collection looks like the following:

After compiling the program you will get the following results:

conclusion

Since there is no function like a foreach loop in Python, this guide explains different ways to implement similar functionality. These methods include using a “for” loop and the map() function.

Despite the similarities, the foreach loop has the upper hand over the “for” loop. This improves the overall efficiency and readability of your program. However, when you want to review each collection of items you should use a foreach loop. Otherwise, the best option is to use a “for” loop to operate on a specific part of the collection.