April 2019
Intermediate to advanced
646 pages
16h 48m
English
Content preview from Expert Python Programming - Third Edition
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Function and variable annotations
Function annotation is one of the most unique features of Python 3. The official documentation states the following:
"Function annotations are completely optional metadata information about the types used by user-defined functions."
However, they are not restricted to type hinting; also, there is no single feature in Python and its standard library that leverages such annotations. This is why this feature is unique – it does not have any syntactic meaning. Annotations can simply be defined for a function and can be retrieved in runtime, but that is all. What to do with them is left to the developers.
Let's take a look at their general syntax and possible uses in the following sections
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.