How to check if a string contains a substring No matter whether it's just a word, a letter or a phrase that you want to check in a string , with Python you can easily utilize the built-in methods and the membership test in operator.
1) The in Operator The easiest way to check if a Python string contains a substring is to use the in operator. The in operator is used to check data structures for membership in Python . It returns a Boolean (either True or False) and can be used as follows:
In this tutorial we learned about different methods available in Python to check if a string contains substring . Each of these methods have their own pros and cons so based on your requirement you may choose the appropriate function. In most cases the in operator should suffice the requirement using " in " operator.
Q- How to check if a string contains numbers in python . isdigit is another string method useful in checking if a string contains numbers. isdigit() is a method you can apply to a string to check if it contains a number. It outputs a boolean value. (True or False). We will use a for loop to iterate each element in the main string .
Checking if String Contains Substring Using in Keyword One of the cool things about Python is how clean and readable the code can be. Naturally, this applies when checking if a string contains a substring . Instead of a fancy method, Python has the syntax built-in with the
You can also use other methods like string .find() to check if a string contains a substring . string .find(substring) returns the index of substring in string . If the substring is present in the string , then string .find() returns a non-negative integer. We can use this as a condition, and verify if string contains substring . Python Program
Method 1: By using find () method The method find () checks whether a string contains a particular substring or not. If the string contains that particular substring , the method returns the starting index of the substring else it returns -1.
In fact, there is no a frank contains function in Python . meanwhile, There are two ways to check if string contains specific substring in Python:-Using " in" operator: str = " Python is a programming language" if " Python " in str # write your code here if it true Using" find" method that will return an index if it found the substring :
Does Python have a string contains substring method? 99% of use cases will be covered using the keyword, in, which returns True or False: 'substring' in any_string For the use case of getting the index, use str.find (which returns -1 on failure, and has optional positional arguments):. start = 0 stop = len(any_string) any_string.find('substring', start, stop)
To check if string contains substring from a list of strings , iterate over list of strings , and for each item in the list, check if the item is present in the given string . In this type of scenario, we have a source string , in which we have to check if some substring is present.