Adding super().__init__() to MoneyModel tutorial

[sw23]

Noticed this error in my project, so turned to the tutorial for reference, which had the same error!

AttributeError: 'MoneyModel' object has no attribute '_steps'

I poked around and found that model sub-classes now require a call to super().__init__(), which wasn't originally in the tutorial. I also saw someone opened an issue ( #2017 ) to fix the tutorial, so opening this if it's helpful.

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
Schelling	small	🔵 -1.0% [-1.3%, -0.8%]	🔵 -0.1% [-0.3%, +0.1%]
Schelling	large	🔵 +2.1% [+0.9%, +3.2%]	🔵 +0.8% [+0.0%, +1.7%]
WolfSheep	small	🔵 +0.1% [-0.2%, +0.3%]	🔵 +0.2% [+0.1%, +0.3%]
WolfSheep	large	🔵 -0.7% [-1.4%, -0.3%]	🔵 +0.0% [-0.3%, +0.3%]
BoidFlockers	small	🔴 +5.4% [+4.7%, +6.1%]	🔵 -1.1% [-1.8%, -0.3%]
BoidFlockers	large	🔴 +5.3% [+4.8%, +5.8%]	🔵 -1.0% [-1.4%, -0.5%]

[Corvince]

Thank you for bringing this up! This is quite important, because using super().init() should be encouraged (and thus in the tutorial), but not strictly required before mesa 3.0. So it is actually a bug you found.