I'm curious how this is valid Python: def fib(n: int) -> Iterator[int]: - Colon ... | Hacker News

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barumrho on Jan 6, 2015 | parent | context | favorite | on: Type hinting for Python

I'm curious how this is valid Python:

  def fib(n: int) -> Iterator[int]:


  - Colon inside argument list
  - Arrow and type

What are they used for normally?

icebraining on Jan 6, 2015 [–]

They're generic Function Annotations: https://www.python.org/dev/peps/pep-3107/

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