![]() A positive integer, representing the starting index of the first instance of the substring.The string.find() method has two possibilities for return values: This is analogous to many other languages that don’t explicitly support the in operator. The Python find string method allows you to return the starting index of a substring, if it exists. Checking if a Python String Contains a Substring with find In the following section, you’ll learn how to identify where a substring exists in a larger string. Here, it’s important to note that the operator doesn’t check where the substring is, only that it exists. ![]() In the example above, we used the in operator to check if the substring 'datagy' exists in the larger string. Let’s take a look at an example: # Using the in Operator to Check if a String Contains a Substring The in operator will return a boolean value: True if the substring is found in the string and False if it isn’t. The operator clearly expresses what you’re trying to accomplish and makes it clear to any reader of your code. The simplest and most Pythonic way to check if a string in Python contains a substring is to use the in operator. Checking if a Pandas Column Contains a SubstringĬhecking if a Python String Contains a Substring with in.Checking if a Python String Contains a Pattern of Text.Checking if a Python String Contains a Substring without Case Sensitivity.Filtering a List of Strings if They Contain a Substring.Checking if a Python String Contains a Substring with count.Checking if a Python String Contains a Substring with index.Checking if a Python String Contains a Substring with find.Checking if a Python String Contains a Substring with in.
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