What is the feature of functions in python?

There is such code:
def activator(update: Update, context: CallbackContext):
 pass


When declaring the arguments of a function is followed by a colon.
So, what is the mechanism? What is it called? What does?
April 19th 20 at 12:35

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April 19th 20 at 12:37
Solution
The annotation is called.
April 19th 20 at 12:39
Solution
Annotations.
Interesting article on the topic - Introduction to type annotations in Python

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