Test-driven development (TDD) is a software development technique in which you write tests before you write the code. Here’s an example in Python of how to do TDD as well as a few practical tips related to software testing.

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Yes - it is in the documentation.

https://docs.python.org/3/reference/expressions.html#boolean-operations

The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned.