Learn how to check if one Python string contains another using the contains () method. This case-sensitive instance method returns True or False based on …

September 10, 2025 - Python counted how often the substring appears in the string and returned the answer. The text contains the substring four times. But what do these substrings look like? You can inspect all the substrings by splitting your text at default word borders and printing the words to your terminal using a for loop: ... >>> for word in file_content.split(): ... if "secret" in word: ... print(word) ... secret secret. secret, secretly · In this example, you use .split() to separate the text at whitespaces into strings, which Python packs into a list.

May 31, 2024 - In this article, we will discuss different ways to check whether the given substring exists in the string or not. 1. Quick Examples of string contains

April 27, 2023 - The ‘in’ operator, find(), and index() methods are frequently used to check for a substring within a string by developers and we have attached the link to our tutorial on each above-mentioned string method so that you can read them too, but for this tutorial, we will be using the built-in function __contains__(). The Python string __contains__() function can be used with a string object, it takes a substring as an argument and returns True if the substring is present in the string.

For example, the following code checks if the string “hello” contains the substring “ell” using a regular expression: import re string = "hello" substring = "ell" pattern = r"ell" if re.search(pattern, string): print("The substring is ...

February 12, 2026 - A return value of 0 means "not found," so you could technically use .count() > 0 as a contains check. But that's doing extra work — it scans the entire string counting occurrences when you only need to know if there's at least one.

December 5, 2023 - In this example, we have a string ‘Hello, World!’ and we are checking if it contains the substring ‘World’. The in keyword in Python returns True if the substring exists in the string, and False otherwise.

Same as startswith, but tests the end of string. ... Returning a Series of booleans using only a literal pattern. >>> s1 = pd.Series(["Mouse", "dog", "house and parrot", "23", np.nan]) >>> s1.str.contains("og", regex=False) 0 False 1 True 2 False 3 False 4 False dtype: bool

December 20, 2025 - The in operator in Python checks if one string occurs within another. It evaluates to True if the substring is present in the main string, otherwise False. ... s = "Geeks welcome to the Geek Kingdom!" if "Geek" in s: print("Substring found!") else: print("Substring not found!") if "For" in s: print("Substring found!") else: print("Substring not found!") ... Substring found! Substring not found! ... The operator.contains() function checks for substring presence in a string programmatically.

For more detailed checks, like finding the position of the substring or avoiding exceptions, methods like .find(), .index(), and .contains() come into play. If you want to learn more about strings and string operations in Python, check out the Learn Python 3 course on Codecademy. Yes, the in operator is case-sensitive. For example, “Apple” in “Pineapple” returns False because of the capital “A”.

December 20, 2022 - To check if a Python string contains the desired substring, you can use the "in" operator or the string.find() method.

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. Towards the end, there is also a section on employing regular expressions (regex) with re.search() to search strings. ... Go from side-hustling to earning enough to quit your job. Check it out → · The example above demonstrated a quick way to find a substring within another string using an if ...

May 25, 2020 - If you are coming to Python from Java, for instance, you might have used the contains method to check if some substring exists in another string. In Python, there are two ways to achieve this. The easiest way is via Python’s in operator. Let’s take a look at this example.

April 14, 2026 - The python str class has a __contains__() method that will check if a python string contains a substring. It will return true if it’s found and will return false if it’s not. You will notice that the method name is wrapped in two underscores.

March 31, 2026 - Python’s text strings are Unicode. Substring operations are case-sensitive by default and implemented in C for speed. The most direct way to test if text appears inside a string is the in operator, which returns a Boolean using the string’s __contains__() implementation.

July 18, 2026 - What if you need to check whether one string contains another specifically at the beginning or the end of the string? You can use the string startswith method to check whether one string starts with another string: >>> whole = "I enjoy writing Python code." >>> whole.startswith("You ") False >>> whole.startswith("I ") True

November 7, 2025 - Output The string contains the substring ‘Python’.

Same as startswith, but tests the end of string. ... Returning a Series of booleans using only a literal pattern. >>> s1 = pd.Series(["Mouse", "dog", "house and parrot", "23", np.nan]) >>> s1.str.contains("og", regex=False) 0 False 1 True 2 False 3 False 4 False dtype: bool

January 10, 2024 - To check if a string contains multiple ... ... string = "Hello, World!" substrings = ["Hello", "Python"] if all(substring in string for substring in substrings): print("All substrings found!") else: print("One or more substrings not found.")...