Change to syntax to compile?

[RewindTheGame]

I know I've seen this in an update log somewhere, but I can't for the life of me find it now. Moving up from RenPy 8.1.3 to the latest version, I get this error in the inventory code. I think it's something to do with the way the -> format has changed and simply requires a syntax change to some lines of code, but I can't remember where I saw the fix and can't find it now. Can anyone help?

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I'm sorry, but an uncaught exception occurred.

While running game code:
  File "game/inventory.rpy", line 676, in script
    init python:
  File "game/inventory.rpy", line 676, in script
    init python:
  File "game/inventory.rpy", line 684, in <module>
    def findLast(l: list, val) -> Optional[int]:
NameError: name 'Optional' is not defined

[jeffster]

Type hints give that error in the latest builds. I think it's just a temporary development thing. Just use some stable release instead of "nightly" or whatever you are using.

Otherwise, just delete those type hints - here parts between ) and :.

Instead of

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    def findLast(l: list, val) -> Optional[int]:

this should work:

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    def findLast(l: list, val):

or this:

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    def findLast(l, val):

[jeffster]

I know I've seen this in an update log somewhere, but I can't for the life of me find it now. Moving up from RenPy 8.1.3 to the latest version, I get this error in the inventory code.

PS. Oops, no, I believe that's a bug in Ren'Py.
viewtopic.php?t=68117

For now the way to get rid of those errors is either use Ren'Py 8.1, or delete those type hints from the script (there are just a few of them).

[PyTom]

You probably need:

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init python:
    from typing import Optional

[jeffster]

You probably need:

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init python:
    from typing import Optional

I wonder why Ren'Py 8.1 didn't need that import line. Now it needs

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init python:
    from typing import Optional, Union