Converting all Strings in a List to Integers - Python Last Updated : 11 Jul, 2025 Comments Improve Suggest changes 31 Likes Like Report We are given a list of strings containing numbers and our task is to convert these strings into integers. For example, if the input list is ["1", "2", "3"] the output should be [1, 2, 3]. Note: If our list contains elements that cannot be converted into integers such as alphabetic characters, strings or special symbols, trying to convert them using int() will raise a ValueError or Invalid Literal Error. Let's discuss various ways to convert all string elements in a list to integers in Python.Using map()map() function applies a given function to all elements in an iterable. Here, we use map(int, a) to convert each string in the list to an integer. Python a = ['2', '4', '6', '8'] b = list(map(int, a)) print(b) Output[2, 4, 6, 8] Explanation:map(int, a) applies the int() function to every item in the list 'a'.list(map(int, a)) converts the result of map() into a list.Using list comprehensionList comprehension provides a more Pythonic and concise way to convert a list of strings to integers as it combines the conversion and iteration into a single line of code. Python a = ['2', '4', '6', '8'] b = [int(item) for item in a] print(b) Output[2, 4, 6, 8] Explanation:int(item) converts each string in the list to an integer.[int(item) for item in a] this list comprehension goes through each element (item) of 'a', applies int() and collects the results in a new list.Using a loopIn this approach we iterate over the list using a loop (for loop) and convert each string to an integer using the int() function. Python a = ['2', '4', '6', '8'] for i in range(len(a)): a[i] = int(a[i]) print(a) Output[2, 4, 6, 8] Explanation:for i in range(len(a)) iterates over the indices of the list a.a[i] = int(a[i]) converts each string at index i to an integer and updates the list in place.Related Articles:Python map() functionList Comprehension in PythonPython For LoopsConvert integer to string in PythonConvert String to Integers in PythonConvert number to list of integers in PythonIntegers String to Integer List in Python Create Quiz Comment M manjeet_04 Follow 31 Improve M manjeet_04 Follow 31 Improve Article Tags : Python python-list Python list-programs Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 4 min read Python Operators 4 min read Python Keywords 2 min read Python Data Types 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 5 min read Python Functions 5 min read Recursion in Python 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 3 min read Python MySQL 9 min read Python Packages 10 min read Python Modules 3 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 4 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 3 min read StatsModel Library - Tutorial 3 min read Learning Model Building in Scikit-learn 6 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 6 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 5 min read Build a REST API using Flask - Python 3 min read Building a Simple API with Django REST Framework 3 min read Python PracticePython Quiz 1 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like