Use of colon in variable declaration [duplicate]

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You are looking at an annotation for a variable. The hint is moved to the __annotations__ mapping:

>>> char: str
>>> __annotations__
{'char': <class 'str'>}

Variable annotations are there to support third-party tooling, such as type checkers; the syntax is new in Python 3.6.

See PEP 526 — Syntax for Variable Annotations, and What’s new in Python 3.6:

Just as for function annotations, the Python interpreter does not attach any particular meaning to variable annotations and only stores them in the __annotations__ attribute of a class or module.

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