Lesson 49 of 55
10 mins readPython Coroutines & Cooperative Multitasking
In Plain English
Coroutines (threads) enable cooperative multitasking. A coroutine can suspend execution with `coroutine.yield()` and resume right where it left off with `coroutine.resume()`.
Deep Dive: How It Works
coroutine.create(fn): Returns a new coroutine (type `thread`) in `suspended` state.
coroutine.resume(co, ...): Starts or resumes execution, passing arguments into the coroutine.
coroutine.yield(...): Pauses the coroutine and returns values back to the resuming caller.
Generators: Building infinite Fibonacci sequences or data stream pipelines.
Core Rules to Remember
Cooperative Multitasking: Coroutines explicitly yield control; no preemption or race conditions.
Bidirectional Data Passing: Pass values in via `resume` and receive values out via `yield`.
Live Interactive Example
Hit Run Code to see it liveProducer-Consumer Generator with Coroutines
Python 3.12
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Output Console
Click "Run Code" to view the rendered output.
How it works: coroutine.yield paused the generator and resume fetched the next number.
Your Turn: Micro Challenge
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Micro Exercise
Step Coroutine Yields
- Create `local co = coroutine.create(function() coroutine.yield("Step 1") return "Step 2" end)`.
- Call `coroutine.resume(co)` twice and print both returned values.
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Sandbox Output
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