Substring = "tack" if fullstring.find(substring) != - 1: If find() doesn't find a match, it returns -1, otherwise it returns the left-most index of the substring in the larger string:Äownload the eBook fullstring = "StackAbuse" The String class has another method called find() which is more convenient to use than index(), mainly because we don't need to worry about handling any exceptions. Though - for the sake of checking whether a string contains a substring, this is a verbose approach. The method itself returns the index: print(fullstring.index(substring)) This method is useful if you also need to know the position of the substring, as opposed to just its existence within the full string. If the substring is not found, a ValueError exception is thrown, which can be handled with a try-except-else block: fullstring = "StackAbuse" The String type in Python has a method called index() that can be used to find the starting index of the first occurrence of a substring in a string. Substring = "tack" if fullstring != None and substring in fullstring: To avoid this, you'll first want to check whether it points to None or not: fullstring = None TypeError: argument of type 'NoneType' is not iterable It's worth noting that it's not null-safe, so if our fullstring was pointing to None, an exception would be thrown: This operator is shorthand for calling an object's _contains_ method, and also works well for checking if an item exists in a list. Substring = "tack" if substring in fullstring: To check if a string contains a substring in Python using the in operator, we simply invoke it on the superstring: fullstring = "StackAbuse" It returns a Boolean (either True or False). The in operator is used to check data structures for membership in Python. The easiest way to check if a Python string contains a substring is to use the in operator. In this guide, we'll take a look at how to check if a string contains a substring in Python. Additionally, depending on your domain model - checking if a string contains a substring may also allow you to infer fields of an object, if a string encodes a field in itself. Checking whether a string contains a substring aids to generalize conditionals and create more flexible code.
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