How to Use a Foreach Function in Python 3


By squashlabs, Last Updated: November 2, 2023

How to Use a Foreach Function in Python 3

The “foreach” function, also known as a “for-each” loop, is a useful construct in Python 3 for iterating over elements in a collection. It allows you to perform a specific operation on each item in the collection without the need to manually manage the index or length of the collection. In Python, the “foreach” function is implemented using the “for” loop.


The syntax for using the “foreach” function in Python 3 is as follows:

for item in collection:
    # code to be executed for each item

In this syntax, “item” is a variable that represents each element in the collection, and “collection” is the iterable object you want to loop through. The code inside the loop will be executed once for each item in the collection.

Related Article: String Comparison in Python: Best Practices and Techniques

Example 1: Iterating over a List

Let’s start with a simple example of using the “foreach” function to iterate over a list in Python:

fruits = ['apple', 'banana', 'orange']

for fruit in fruits:



In this example, the “fruits” list contains three elements: ‘apple’, ‘banana’, and ‘orange’. The “foreach” loop iterates over each item in the list and prints it to the console.

Example 2: Iterating over a Dictionary

You can also use the “foreach” function to iterate over a dictionary in Python. When iterating over a dictionary, the “item” variable represents the keys of the dictionary. To access the corresponding values, you can use the “item” variable as the key:

student_scores = {'John': 90, 'Jane': 85, 'Alex': 95}

for student in student_scores:
    print(f"{student}: {student_scores[student]}")


John: 90
Jane: 85
Alex: 95

In this example, the “student_scores” dictionary contains the names of students as keys and their corresponding scores as values. The “foreach” loop iterates over each key in the dictionary and prints both the key (student name) and value (score) to the console.

Best Practices

When using the “foreach” function in Python, consider the following best practices:

1. Use descriptive variable names: Choose meaningful names for the “item” variable and the collection variable to improve the readability of your code. For example, if you are iterating over a list of books, you could use “book” as the variable name instead of “item”.

2. Avoid modifying the collection: It is generally recommended not to modify the collection while iterating over it using a “foreach” loop. Modifying the collection can lead to unexpected behavior and errors. If you need to modify the collection, consider creating a copy of it before iterating.

3. Use list comprehension for transformations: If you need to transform the elements in the collection, consider using list comprehension instead of modifying the original collection within the “foreach” loop. List comprehension provides a concise and efficient way to create a new list based on an existing one.

4. Use the “enumerate” function for accessing both index and value: If you need to access both the index and value of each item in the collection, you can use the “enumerate” function in combination with the “foreach” loop. The “enumerate” function returns both the index and value of each item in the collection.

fruits = ['apple', 'banana', 'orange']

for index, fruit in enumerate(fruits):
    print(f"Index: {index}, Fruit: {fruit}")


Index: 0, Fruit: apple
Index: 1, Fruit: banana
Index: 2, Fruit: orange

In this example, the “enumerate” function is used to get both the index and value of each fruit in the “fruits” list. The “foreach” loop then prints the index and fruit to the console.

Related Article: How To Limit Floats To Two Decimal Points In Python

More Articles from the Python Tutorial: From Basics to Advanced Concepts series:

How To Rename A File With Python

Renaming files with Python is a simple task that can be accomplished using either the os or shutil module. This article provides a guide on how to rename files using... read more

How To Check If List Is Empty In Python

Determining if a list is empty in Python can be achieved using simple code examples. Two common methods are using the len() function and the not operator. This article... read more

How To Check If a File Exists In Python

Checking if a file exists in Python is a common task for many developers. This article provides simple code snippets and explanations on how to check file existence... read more

How to Use Inline If Statements for Print in Python

A simple guide to using inline if statements for print in Python. Learn how to use multiple inline if statements, incorporate them with string formatting, and follow... read more

How to Use Stripchar on a String in Python

Learn how to use the stripchar function in Python to manipulate strings. This article covers various methods such as strip(), replace(), and regular expressions. Gain... read more

How To Delete A File Or Folder In Python

Deleting files or folders using Python is a common task in software development. In this article, we will guide you through the process step-by-step, using simple... read more