I saw this code in the internet and I'm wounding what's : in this code?
dispatcher : Dispatcher = Updater.dispatcher
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Jawad
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It's a type hint – M Z Jan 14 '21 at 14:41
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3See https://docs.python.org/3/library/typing.html – mousetail Jan 14 '21 at 14:42
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2Does this answer your question? [What are variable annotations?](https://stackoverflow.com/questions/39971929/what-are-variable-annotations) – pippo1980 Jan 14 '21 at 15:55
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It's type-hinting.
https://docs.python.org/3/library/typing.html
It helps the coder know what the object's intended type is. Also, some linter will shows error if you try to invoke some unsupported methods of a class object, similar to a static compiler.
kwkt
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But why when I wrote this command ```i : str = 123;print(type(i))``` I got ```
```, is it supposed to catch the error? – Jawad Jan 14 '21 at 15:01 -
2@Jawad it's type-**hinting**, not type-forcing. Python is still a duck-typed language, it just helps programmers not create avoidable bugs. – kwkt Jan 14 '21 at 15:02