I recently installed Panda 1.9 (64bit version) and ran an old project I hadn’t touched in a while.
It’s a game that allows the user to click to move a character. When I clicked the terrain to move my character, my app crashed with
“SystemError: error return without exception set”
caused by this line of code: if hasattr(target, “model”)
Full method that is crashing is below:
def turnTo(self, target): if hasattr(target, "model"): self.model.lookAt(target.model) else: self.model.lookAt(target)
My app allows you to click either the “terrain” (which is just a large flat .egg file) or another model (the “foes” you fight) . If you click the terrain, the “target” attribute is set to a variable of type ‘panda3d.core.LPoint3f’ (a 3d coord). If you click a foe, the “target” attribute is set to the actual enemy character (a custom class I created).
This was all working without issues in 1.8.1.
I changed the code to this and it worked fine.
def turnTo(self, target): try: self.model.lookAt(target.model) except: self.model.lookAt(target)
To check, I then uninstalled 1.9x64 and re-installed 1.8.1. Sure enough, the original hasattr version of the code worked fine, which tells me something has changed in 1.9.
I do have a solution using try/except, but just curious why this is happening in 1.9x64?