What is python s 3 8 walrus operator and how does it work

the walrus operator `:=` is a new feature introduced in python 3.8. it allows you to assign a value to a variable as part of an expression. this can be useful in situations where you need to both assign a value to a variable and use that value in an expression.

here's how the walrus operator works:

1. you use `:=` to assign a value to a variable within an expression.
2. the expression evaluates to the value that was assigned to the variable.
3. the variable is then available for use later in the code.

here is an example to demonstrate the use of the walrus operator:

in the example above:
- we first ask the user to enter their name using the `input` function.
- in the first part without the walrus operator, we assign the input to the variable `name` and then check its length to determine if the user entered a name.
- in the second part with the walrus operator, we use the walrus operator to both assign the input to the `name` variable and check if it's not an empty string in a single line.

this can make the code more concise and readable, especially in cases where the value assigned to a variable is only used once in the subsequent code.

please note that the walrus operator should be used judiciously to enhance readability and should not be overused, as it may lead to less maintainable code.

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