python in operator custom class
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title: customizing the in operator in python with a custom class
introduction:
the in operator in python is commonly used to check if a value exists in a sequence, such as a list, tuple, or string. however, you can customize the behavior of the in operator for your custom classes by implementing the special method __contains__. in this tutorial, we will explore how to create a custom class in python and customize the in operator for instances of that class.
step 1: define a custom class
let's start by creating a simple class called customcontainer. this class will store a list of values and allow us to check if a specific value is present in the container.
in this example, the customcontainer class has an _init_ method to initialize the values and a _repr_ method to provide a string representation of the object.
step 2: implement the _contains_ method
now, let's implement the _contains_ method to customize the behavior of the in operator for instances of our customcontainer class.
the _contains_ method takes two parameters: self (the instance of the class) and item (the value we want to check for containment). inside the method, we use the in operator to check if item is present in the list of values.
step 3: test the custom class
now, let's create an instance of our customcontainer class and use the in operator to check for the existence of values.
conclusion:
by implementing the _contains_ method in our custom class, we have customized the behavior of the in operator for instances of that class. this allows us to use the in operator seamlessly with our custom containers, providing a powerful and flexible way to work with custom classes in python.
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