I see many instructional books where the title of the book includes cookbook! What is the meaning of cookbook in this situation? Example: Python Testing Cookbook.
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Well, what do cookbooks contain? Recipes!
What is a recipe?
recipe, n. : a set of instructions for making something
As the blurb on the cover of this book says, it contains recipes "for taking control of automated testing using powerful Python testing tools."
One of my favorite programming cookbooks, the C++ Cookbook, contains recipes for creating solutions to common, but time-consuming, tasks in C++.
As Colin Fine notes in his comment, a programming cookbook differs from a reference or tutorial in that it only contains recipes. Although some food cookbooks may attempt to be reference or tutorial (or both, such as [former Microsoft CTO] Nathan Myhrvold's massive and ambitious Modernist Cuisine), most content themselves with presenting recipes in specific cuisines.
Programming cookbooks tend to be even more specific in their scope.