What does this Python function definition mean?

Asked Oct 24 '17 at 20:21

Active Oct 24 '17 at 20:21

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What does this Python function definition mean? I don't recognize the syntax. It doesn't look like any function definition I have ever seen, with the colons, and the -> after the parenthesis.

def new_block(self, proof: int, previous_hash: Optional[str]) -> Dict[str, Any]:

I saw this function definition here: https://github.com/dvf/blockchain/blob/master/blockchain.py

asked Oct 24 '17 at 20:21

Chris Nielsen

This is syntax from the [`typing`](https://docs.python.org/3/library/typing.html) module – Patrick Haugh Oct 24 '17 at 20:22
See e.g http://mypy-lang.org/ for the purpose of this. – Jacques de Hooge Oct 24 '17 at 20:29

What does this Python function definition mean?

0 Answers0