In the following sections, you’ll learn about a few particularities of using in and not in with different built-in data types. However, dictionaries also have explicit methods that allow you to use the membership operators with keys, values, and key-value pairs. By default, membership operations on dictionaries check whether the dictionary has a given key or not. Collections like sets and dictionaries also support these tests. Using in and not in With Different Python TypesĪll built-in sequences-such as lists, tuples, range objects, and strings-support membership tests with the in and not in operators. With this quick overview of how membership operators work, you’re ready to go to the next level and learn how in and not in work with different built-in data types. Therefore, you should use not in as a single operator instead of using not to negate the result of in. However, the former construct is more difficult to read. Note: The not value in collection construct works the same as the value not in collection one. Now that you know what membership operators are, it’s time to learn the basics of how they work. Later, you’ll learn more about the Python data types that support membership tests.īecause membership operators always evaluate to a Boolean value, Python considers them Boolean operators just like the and, or, and not operators. On the other hand, if you try and find a value in something that doesn’t support membership tests, then you’ll get a TypeError. In other words, those expressions will always return either True or False. If you use the in and not in operators correctly, then the expressions that you build with them will always evaluate to a Boolean value. _contains_() method or a user-defined class that explicitly supports membership tests or iteration. It can also be a class that implements the. Meanwhile, collection can be any data type that can hold collections of values, including lists, tuples, strings, sets, and dictionaries. In these expressions, value can be any Python object. Reliance Industries Ltd.Value in collection value not in collection.
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