Should transform insert a CanvasBase instead of an InstructionGroup ?

[gottadiveintopython]

If you are using Python3.7, transform is a bit annoying to use because you need two steps to applying a Matrix.

with transform(widget) as ig:  # <- InstructionGroup
    translate = Translate(...)
    rotate = Rotate(...)
    scale = Scale(...)
    ig.add(translate)
    ig.add(rotate)
    ig.add(scale)


# Of course you can write like this but if you don't have a reference to objects, you cannot animate them,
# thus this is pointless.
with transform(widget) as ig:  # <- InstructionGroup
    ig.add(Translate(...))
    ig.add(Rotate(...))
    ig.add(Scale(...))

If it inserts a CanvasBase instead of an InstructioinGroup, we can write like this:

with transform(widget) as c:  # <- CanvasBase
    with c:
        translate = Translate(...)
        rotate = Rotate(...)
        scale = Scale(...)

which is clearly easier to read. But since Python3.8 introduced the walrus operator, this may not be a problem anymore.

with transform(widget) as ig:  # <- InstructionGroup
    ig.add(translate := Translate(...))
    ig.add(rotate := Rotate(...))
    ig.add(scale := Sclae(...))