Task: Implement a Run Loop Mode Simulation in Python

Task: Implement a Run Loop Mode Simulation in Python: a task in Terminal-Lego-15k (Harbor dataset). In Apple's iOS/macOS frameworks, NSRunLoop manages event sources (timers, input sources, observers) and operates in different "modes." Two key modes are:

The task

In Apple's iOS/macOS frameworks, `NSRunLoop` manages event sources (timers, input sources, observers) and operates in different "modes." Two key modes are:

Part of PrimeIntellect/Terminal-Lego-15k.