[Fixed in Ren'Py 6.15] lists are not of type list

[Ayutac]

Hey there, check out this code:

Code: Select all

label start:
    
    python:
        chars = [0, 1]
        chars = 1 * chars
        chars.append(3)
        narrator(str(type(chars)))
        if isinstance(chars, list):
            narrator("instance list")
        if type(chars) == list:
            narrator("type list")

The code doesn't jump in any condition but the first narrator returns:

Code: Select all

<type 'list'>

What's wrong, how can I check for a list?

I'm especially sad about this because I rewrote my core code for three days and now I can't go on with the debugging.
(And yes, I actually do type checks in python.)

[Kinsman]

If you remove the line

Code: Select all

chars = 1 * chars

you'll find that Ren'py reports chars as being a "RevertableList", but then every type check will work successfully.

I think Ren'Py is adding wrappers to the standard types in order to give them the ability to rollback. The wrapper is almost perfect, but the operation of multiplying the list by an integer fell through the cracks, changing the RevertableList into an ordinary list, and confusing Ren'Py.

Let PyTom know about the problem with multiplying lists, and if you need to multiply, use a loop and multiply each item.

[Ayutac]

and if you need to multiply, use a loop and multiply each item.

would be an option, as well as using tuples because my methods accept them too. Tuples have no renpy-specific type, they are just of type 'tuple'.

I wonder more why the type check for a normal list doesn't work at all. I just checked the isinstance-if with a python console (python 2.7.3), but that works just fine. My Ren'Py is up to date.

[PyTom]

This is fixed in this commit, which will be in 6.15.

https://github.com/renpy/renpy/commit/8 ... ea50f2f94b

[Ayutac]

Thank you very much!