To check if a string contains another string in Python, use the in membership operator. This is the recommended method for confirming the presence of a substring within a string.

Dec 20, 2025 · The operator.contains () function checks for substring presence in a string programmatically. It provides the same result as the in operator but belongs to Python’s operator …

Aug 9, 2010 · Other languages may have no methods to directly test for substrings, and so you would have to use these types of methods, but with Python, it is much more efficient to use the in …

Today we'll take a look at the various options you've got for checking if a string contains a substring. We'll start by exploring the use of if ... in statements, followed by using the find() function.

Mar 22, 2025 · The concept behind string.contains() is simple: it checks whether a given substring is present within a larger string. If the substring is found, it returns a boolean value (True or False), …

Feb 24, 2025 · Learn how to check if one string contains another in Python using in, find (), and regular expressions. Explore common pitfalls, and efficient practices.

Sep 16, 2025 · It’s common to reach for .find() or .index() to check if text exists in a string—and then run into odd behavior like a ValueError or a missed match at the start of the string. Case sensitivity, off …

Apr 27, 2023 · This article will show you the various built-in functions to check if a string contains a substring in Python. The main function that is our main focus for this article is Python’s __contains__ …

there are 2 sister methods called str.rfind() and str.rindex() which start the search from the end of the string and work their way towards the beginning. in addition, as others have already shown, the in …

Jan 5, 2026 · In this tutorial, I will walk you through the most efficient ways to check if a Python string contains a substring, using practical examples you’ll actually encounter in the field.