Since Python 3.8, the "walrus" operator (:=) enables assignment expressions, a significant feature that allows assignments within comprehensions and lambdas.
The primary reason behind the introduction of this concept was to facilitate assignments within comprehensions and lambda functions, where traditional assignments are not allowed. Additionally, it enhances interactive debugging, eliminating the need for code restructuring.
An assignment expression has the form name := expr, where expr is a valid Python expression and name is an identifier. Its value is the same as expr, with the additional side effect of the variable name being assigned that value.
Differences from Regular Assignment Statements:
Assignment expressions differ from regular assignment statements in the following ways:
Getting Conditional Values:
<code class="python">while (command := input("> ")) != "quit": print("You entered:", command)</code>
Simplifying List Comprehensions:
<code class="python">[[y := x+1, x/y] for x in range(5)]</code>
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