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https://realpython.com/python-in-operator/

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Python's "in" and "not in" Operators: Check for Membership

Python’s in and not in operators allow you to quickly check if a given value is or isn’t part of a collection of values. This type of check is generally known as a membership test in Python. Therefore, these operators are known as membership operators. By the end of this tutorial, you’ll understand that:

https://note.nkmk.me/en/python-in-basic/

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The in Operator in Python (for List, String, Dictionary)

x in y returns True if x is included in y, and False otherwise. The in operator can be used not only with list, but also with other iterable objects such as tuple, set, and range. Details about dictionaries (dict) and strings (str) are described later. The in operator tests for value equality.

https://www.askpython.com/python/examples/in-and-not-in-operators...

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Python “in” and “not in” Membership Operators: Examples and Usage

Python “in” operator is used to check whether a specified value is a constituent element of a sequence like string, array, list, tuple, etc. When used in a condition, the statement returns a Boolean result evaluating either True or False. When the specified value is found inside the sequence, the statement returns True.

https://stackoverflow.com/questions/19775692/use-and-meaning-of-i...

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python - Use and meaning of "in" in an if statement? - Stack Overflow

It may also help to search Google using operators-- for example, python "in" operator gives exactly what you would need in its first few results. On recent Pythons (2.6+), you should not use next as a variable name. You will overwrite the built-in function next.

https://www.geeksforgeeks.org/python-membership-identity-operator...

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Python Membership and Identity Operators - GeeksforGeeks

Example: In this code we have initialized a list, string, set, dictionary and a tuple. Then we use operator module's contain () function to check if the element occurs in the corresponding sequences or not.

https://www.w3schools.com/python/gloss_python_membership_operator...

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Python Membership Operators - W3Schools

Python Membership Operators. Membership operators are used to test if a sequence is presented in an object: Operator Description Example Try it; in : Returns True if a sequence with the specified value is present in the object:

https://www.codingem.com/in-operator-in-python/

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Python "in" and "not in" Operators - codingem.com

In Python, you can use the in operator to check if a value exists in a group of values. For example: Similarly, you can check if a value is not in a collection with not in operation (combining the not operator and the in operator): The in operator works with iterable types, such as lists or strings, in Python.

https://www.tutorialspoint.com/python/python_membership_operators...

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Python Membership Operators - Online Tutorials Library

Python has two membership operators: in and not in. Both return a Boolean result. The result of in operator is opposite to that of not in operator. The " in " operator is used to check whether a substring is present in a bigger string, any item is present in a list or tuple, or a sub-list or sub-tuple is included in a list or tuple.

https://www.codevscolor.com/python-in-and-not-in-operators

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Python in and not in operators explanation with examples

Python in operator is used to check if an item is in a sequence or not. This operator returns a boolean value. So, if the element is in that sequence, it returns True, else it returns False. We can use it with sequences like array, list, tuple, list etc. Let me show you examples with different types of sequences. Let’s try it with arrays:

https://zerotobyte.com/python-membership-operators-in-and-not-in-...

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Python Membership Operators “in” and “not in” Explained

In the following examples, I’ll show you how to use the “in” operator and its negation “not in” operator. The most common example of using the “in” operator in Python is checking if a particular value or object is part of a list or if a specific character is part of a string.

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