[Solved] Variable losing definition upon using 'return' command

[Palas]

Hello! I have been getting this strange exception upon returning to the main menu.

Code: Select all

I'm sorry, but an uncaught exception occurred.

While running game code:
NameError: name 'robo_mesa' is not defined

-- Full Traceback ------------------------------------------------------------

Full traceback:
  File "renpy/common/_layout/screen_main_menu.rpym", line 28, in script
    python hide:
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\ast.py", line 914, in execute
    renpy.python.py_exec_bytecode(self.code.bytecode, self.hide, store=self.store)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\python.py", line 2028, in py_exec_bytecode
    exec bytecode in globals, locals
  File "renpy/common/_layout/screen_main_menu.rpym", line 28, in <module>
    python hide:
  File "renpy/common/_layout/screen_main_menu.rpym", line 35, in _execute_python_hide
    ui.interact()
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\ui.py", line 297, in interact
    rv = renpy.game.interface.interact(roll_forward=roll_forward, **kwargs)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\core.py", line 2702, in interact
    repeat, rv = self.interact_core(preloads=preloads, trans_pause=trans_pause, **kwargs)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\core.py", line 3194, in interact_core
    self.draw_screen(root_widget, fullscreen_video, (not fullscreen_video) or video_frame_drawn)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\core.py", line 2094, in draw_screen
    renpy.config.screen_height,
  File "renpy/display/render.pyx", line 490, in renpy.display.render.render_screen (gen\renpy.display.render.c:6805)
    rv = render(root, width, height, st, st)
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 722, in render
    surf = render(child, width, height, cst, cat)
  File "renpy/display/render.pyx", line 166, in renpy.display.render.render (gen\renpy.display.render.c:4075)
    cpdef render(d, object widtho, object heighto, double st, double at):
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\transition.py", line 360, in render
    bottom = render(self.old_widget, width, height, st, at)
  File "renpy/display/render.pyx", line 166, in renpy.display.render.render (gen\renpy.display.render.c:4075)
    cpdef render(d, object widtho, object heighto, double st, double at):
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 722, in render
    surf = render(child, width, height, cst, cat)
  File "renpy/display/render.pyx", line 166, in renpy.display.render.render (gen\renpy.display.render.c:4075)
    cpdef render(d, object widtho, object heighto, double st, double at):
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 722, in render
    surf = render(child, width, height, cst, cat)
  File "renpy/display/render.pyx", line 166, in renpy.display.render.render (gen\renpy.display.render.c:4075)
    cpdef render(d, object widtho, object heighto, double st, double at):
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "accelerator.pyx", line 110, in renpy.display.accelerator.transform_render
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\image.py", line 500, in render
    return wrap_render(self.target, width, height, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\image.py", line 306, in wrap_render
    rend = render(child, w, h, st, at)
  File "renpy/display/render.pyx", line 166, in renpy.display.render.render (gen\renpy.display.render.c:4075)
    cpdef render(d, object widtho, object heighto, double st, double at):
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 336, in render
    surf = render(self.child, width, height, st, at)
  File "renpy/display/render.pyx", line 166, in renpy.display.render.render (gen\renpy.display.render.c:4075)
    cpdef render(d, object widtho, object heighto, double st, double at):
  File "renpy/display/render.pyx", line 259, in renpy.display.render.render (gen\renpy.display.render.c:3520)
    rv = d.render(widtho, heighto, st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 1283, in render
    self.update(st, at)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 1265, in update
    child, redraw = self.function(st, at, *self.args, **self.kwargs)
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 1341, in condition_switch_show
    return condition_switch_pick(switch), None
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\display\layout.py", line 1334, in condition_switch_pick
    if renpy.python.py_eval_bytecode(code):
  File "C:\Users\Acer\Documents\RenPy\renpy-7.3.5-sdk\renpy\python.py", line 2052, in py_eval_bytecode
    return eval(bytecode, globals, locals)
  File "<none>", line 1, in <module>
NameError: name 'robo_mesa' is not defined

Windows-8-6.2.9200
Ren'Py 7.3.5.606
D08C02A 1.0
Mon Dec 02 20:25:43 2019

"robo_mesa" is a variable that determines which image should appear on a certain screen:

Code: Select all

image robomesa = ConditionSwitch(
        "robo_mesa == 'aranha'","Robos/h_mon_aranha.png",
        "robo_mesa == 'cachorro'","Robos/h_mon_cachorro.png",
        "robo_mesa == 'cavalo'","Robos/h_mon_cavalo.png",
        "robo_mesa == 'cobra'","Robos/h_mon_cobra.png",
        "robo_mesa == 'elefante'","Robos/h_mon_elefante.png",
        "robo_mesa == 'flamingo'","Robos/h_mon_flamingo.png",
        "robo_mesa == 'gato'","Robos/h_mon_gato.png",
        "robo_mesa == 'passaro'","Robos/h_mon_passaro.png",
        "robo_mesa == 'siri'","Robos/h_mon_siri.png",
        "robo_mesa == 'sucata'","Robos/h_mon_sucata.png",
        "robo_mesa == 'nada'","Robos/h_mon_nada.png",
        "True", "Robos/h_mon_nada.png" #Just, you know. To be sure
        )

Said variable is determined by a choice that happens every scene. The problem is, if I use "return" while in the screen in which the image "robomesa" appears, I get that exception. But the image shows up just fine and anything else I do before actually returning to the main menu works too. I'm puzzled - why would the main menu erase this particular variable's definitions or call it, but not any other? I haven't even touched the main menu's default code.

Now, sure, I can make it persistent, but that seems suboptimal. I'm also curious about what is happening, so if you guys could help me, I'd really appreciate it!

Also, the version used is 7.3.5 (the latest as of Dec 03)

EDIT after solving: All I had to do was to declare the variable with default. Thanks, trooper6 and Alex!

[trooper6]

Have you initialized rob_mesa before the start label using default?

Code: Select all

default robo_mesa = "None"

label start:
    "Blah Blah"

[Palas]

Have you initialized rob_mesa before the start label using default?

Code: Select all

default robo_mesa = "None"

label start:
    "Blah Blah"

I hadn't, and now I did, and now it works! Thank you very much. But why does initializing with default works, but initializing/defining with $ doesn't?

[Alex]

Check this article about similar issues - https://www.renpy.org/doc/html/save_load_rollback.html

Test your code now, I presume that after 'return' your image bacame the default one... If so, try to do it like - https://www.renpy.org/doc/html/save_loa ... after-load

[Palas]

Check this article about similar issues - https://www.renpy.org/doc/html/save_load_rollback.html

Test your code now, I presume that after 'return' your image bacame the default one... If so, try to do it like - https://www.renpy.org/doc/html/save_loa ... after-load

I see! Thanks a lot~ I'll mark this as solved now.

[trooper6]

define is for initializing variables that won't change ever, like:

define days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

default is for initializing variables that will change.

$ is just telling Renpy that you are giving it a line of python code. Use that to change variables after you've initialized it, but it won't initialize the variable.

Hope that helps.

[Imperf3kt]

More on define vs default
https://www.renpy.org/dev-doc/html/python.html